add partial docs for astro:build:ssr options

`entryPoints` added in withastro/astro#7220 so v2.7.0
`middlewareEntryPoint` added in withastro/astro#7532 so 2.8.0

src/content/docs/en/reference/integrations-reference.mdx

@@ -1086,6 +1086,72 @@ export default {
 }) => void | Promise<void>;
 ```
 
+#### `manifest` option
+
+<p>
+
+**Type:** `SerializedSSRManifest`
+</p>
+
+{/* I still need to figure this one out. */}
+
+```js
+export default {
+  name: 'my-integration',
+  hooks: {
+    'astro:build:ssr': ({ manifest }) => {
+      // still not sure about the use case...
+    },
+  },
+}
+```
+
+#### `entryPoints` option
+
+<p>
+
+**Type:** `Map<IntegrationRouteData, URL>`<br />
+<Since v="2.7.0" />
+</p>
+
+A `Map` with a list of `IntegrationRouteData` as key and the physical file URL as value.
+
+```js
+export default {
+  name: 'my-integration',
+  hooks: {
+    'astro:build:ssr': ({ entryPoints }) => {
+      entryPoints.forEach((url) => {
+        console.log(url.href);
+      });
+    },
+  },
+}
+```
+
+#### `middlewareEntryPoint` option
+
+<p>
+
+**Type:** `URL | undefined`<br />
+<Since v="2.8.0" />
+</p>
+
+Exposes the middleware file path.
+
+```js
+export default {
+  name: 'my-integration',
+  hooks: {
+    'astro:build:ssr': ({ middlewareEntryPoint }) => {
+      if (middlewareEntryPoint) {
+        // do some operations
+      }
+    },
+  },
+}
+```
+
 ### `astro:build:done`
 
 **Previous hook:** [`astro:build:ssr`](#astrobuildssr)