docs(readme): spelling and grammar fixes (#351)

Signed-off-by: Frazer Smith <[email protected]>

README.md

@@ -47,9 +47,9 @@ You can use it as is without passing any option or you can configure it as expla
 ### Options
 * `origin`: Configures the **Access-Control-Allow-Origin** CORS header. The value of origin could be of different types:
   - `Boolean` - set `origin` to `true` to reflect the [request origin](http://tools.ietf.org/html/draft-abarth-origin-09), or set it to `false` to disable CORS.
-  - `String` - set `origin` to a specific origin. For example if you set it to `"http://example.com"` only requests from "http://example.com" will be allowed. The special `*` value (default) allows any origin.
+  - `String` - set `origin` to a specific origin. For example, if you set it to `"http://example.com"` only requests from "http://example.com" will be allowed. The special `*` value (default) allows any origin.
   - `RegExp` - set `origin` to a regular expression pattern that will be used to test the request origin. If it is a match, the request origin will be reflected. For example, the pattern `/example\.com$/` will reflect any request that is coming from an origin ending with "example.com".
-  - `Array` - set `origin` to an array of valid origins. Each origin can be a `String` or a `RegExp`. For example `["http://example1.com", /\.example2\.com$/]` will accept any request from "http://example1.com" or from a subdomain of "example2.com".
+  - `Array` - set `origin` to an array of valid origins. Each origin can be a `String` or a `RegExp`. For example, `["http://example1.com", /\.example2\.com$/]` will accept any request from "http://example1.com" or from a subdomain of "example2.com".
   - `Function` - set `origin` to a function implementing some custom logic. The function takes the request origin as the first parameter and a callback as a second (which expects the signature `err [Error | null], origin`), where `origin` is a non-function value of the origin option. *Async-await* and promises are supported as well. The Fastify instance is bound to function call and you may access via `this`. For example:
   ```js
   origin: (origin, cb) => {
@@ -67,13 +67,13 @@ You can use it as is without passing any option or you can configure it as expla
 * `hook`: See the section `Custom Fastify hook name` (default: `onRequest`)
 * `allowedHeaders`: Configures the **Access-Control-Allow-Headers** CORS header. Expects a comma-delimited string (ex: `'Content-Type,Authorization'`) or an array (ex: `['Content-Type', 'Authorization']`). If not specified, defaults to reflecting the headers specified in the request's **Access-Control-Request-Headers** header.
 * `exposedHeaders`: Configures the **Access-Control-Expose-Headers** CORS header. Expects a comma-delimited string (ex: `'Content-Range,X-Content-Range'`) or an array (ex: `['Content-Range', 'X-Content-Range']`). If not specified, no custom headers are exposed.
-* `credentials`: Configures the **Access-Control-Allow-Credentials** CORS header. Set to `true` to pass the header, otherwise it is omitted.
-* `maxAge`: Configures the **Access-Control-Max-Age** CORS header. In seconds. Set to an integer to pass the header, otherwise it is omitted.
+* `credentials`: Configures the **Access-Control-Allow-Credentials** CORS header. Set to `true` to pass the header, otherwise, it is omitted.
+* `maxAge`: Configures the **Access-Control-Max-Age** CORS header. In seconds. Set to an integer to pass the header, otherwise, it is omitted.
 * `cacheControl`: Configures the **Cache-Control** header for CORS preflight responses. Set to an integer to pass the header as `Cache-Control: max-age=${cacheControl}`, or set to a string to pass the header as `Cache-Control: ${cacheControl}` (fully define the header value), otherwise the header is omitted.
 * `preflightContinue`: Pass the CORS preflight response to the route handler (default: `false`).
 * `optionsSuccessStatus`: Provides a status code to use for successful `OPTIONS` requests, since some legacy browsers (IE11, various SmartTVs) choke on `204`.
 * `preflight`: if needed you can entirely disable preflight by passing `false` here (default: `true`).
-* `strictPreflight`: Enforces strict requirement of the CORS preflight request headers (**Access-Control-Request-Method** and **Origin**) as defined by the [W3C CORS specification](https://www.w3.org/TR/2020/SPSD-cors-20200602/#resource-preflight-requests) (the current [fetch living specification](https://fetch.spec.whatwg.org/) does not define server behavior for missing headers). Preflight requests without the required headers will result in 400 errors when set to `true` (default: `true`).
+* `strictPreflight`: Enforces strict requirements of the CORS preflight request headers (**Access-Control-Request-Method** and **Origin**) as defined by the [W3C CORS specification](https://www.w3.org/TR/2020/SPSD-cors-20200602/#resource-preflight-requests) (the current [fetch living specification](https://fetch.spec.whatwg.org/) does not define server behavior for missing headers). Preflight requests without the required headers will result in 400 errors when set to `true` (default: `true`).
 * `hideOptionsRoute`: hide options route from the documentation built using [@fastify/swagger](https://github.com/fastify/fastify-swagger) (default: `true`).
 
 #### :warning: DoS attacks
@@ -114,7 +114,7 @@ fastify.listen({ port: 3000 })
 
 ### Custom Fastify hook name
 
-By default, `@fastify/cors` adds a `onRequest` hook where the validation and header injection are executed. This can be customized by passing `hook` in the options. Valid values are `onRequest`, `preParsing`, `preValidation`, `preHandler`, `preSerialization`, and `onSend`.
+By default, `@fastify/cors` adds an `onRequest` hook where the validation and header injection are executed. This can be customized by passing `hook` in the options. Valid values are `onRequest`, `preParsing`, `preValidation`, `preHandler`, `preSerialization`, and `onSend`.
 
 ```js
 import Fastify from 'fastify'
@@ -164,7 +164,7 @@ fastify.register(async function (fastify) {
 fastify.listen({ port: 3000 })
 ```
 
-## Acknowledgements
+## Acknowledgments
 
 The code is a port for Fastify of [`expressjs/cors`](https://github.com/expressjs/cors).