fix a few typos

docs/actions-ruby.md

@@ -43,10 +43,10 @@ Ruby actions always consume a Hash and return a Hash.
 The entry method for the action is `main` by default but may be specified explicitly
 when creating the action with the `wsk` CLI using `--main`, as with any other action type.
 
-You can create an OpenWhisk action called `helloRuby` from this function as follows:
+You can create an OpenWhisk action called `hello_ruby` from this function as follows:
 
 ```
-wsk action create helloRuby hello.rb
+wsk action create hello_ruby hello.rb
 ```
 
 The CLI automatically infers the type of the action from the source file extension.
@@ -55,7 +55,7 @@ For `.rb` source files, the action runs using a Ruby 2.5 runtime.
 Action invocation is the same for Ruby actions as it is for [any other action](actions.md#the-basics).
 
 ```
-wsk action invoke --result helloRuby --param name World
+wsk action invoke --result hello_ruby --param name World
 ```
 
 ```json
@@ -66,7 +66,7 @@ wsk action invoke --result helloRuby --param name World
 
 Find out more about parameters in the [Working with parameters](./parameters.md) section.
 
-### Packaging Ruby actions in zip files
+## Packaging Ruby actions in zip files
 
 You can package a Ruby action along with other files and dependent packages in a zip file.
 The filename of the source file containing the entry point (e.g., `main`) must be `main.rb`.
@@ -80,8 +80,8 @@ zip -r hello_ruby.zip main.rb helper.rb
 and then create the action:
 
 ```bash
-wsk action create helloRuby --kind ruby:2.5 hello_ruby.zip
+wsk action create hello_ruby --kind ruby:2.5 hello_ruby.zip
 ```
 
 A few Ruby gems such as `mechanize` and `jwt` are available in addition to the default and bundled gems.
-You can use arbitrary gem so long as you use zipped actions to package all the dependencies.
+You can use arbitrary gems so long as you use zipped actions to package all the dependencies.