update x-hidden docs and include other label (#675)

Author: lawreka

api-playground/openapi/advanced-features.mdx

@@ -136,40 +136,61 @@ paths:
             planter.list({ potted: true });
 ```
 
-## `x-hidden`
+## `x-hidden` and `x-excluded`
 
-If your pages are [autogenerated](/api-playground/openapi/setup) from an OpenAPI document, but there are some paths that you don't want to create pages for, you can hide them by adding the property `x-hidden`.
+If your pages are [autogenerated](/api-playground/openapi/setup) from an OpenAPI document, but there are some paths that you don't want to create pages for, you can exclude them from having pages generated by adding the property `x-excluded`.
 
-You can add the `x-hidden` tag under endpoint or webhook paths below the method.
+If you want to have pages generated, but not have them appear in the navigation, add `x-hidden`.
+
+You can add the `x-hidden` or `x-excluded` tag under endpoint or webhook paths below the method.
 
 Here's are examples of how that would look in an OpenAPI schema document for an endpoint or a webhook path:
 
-```json {14}
+```json {11, 19}
 "paths": {
   "/plants": {
     "get": {
       "description": "Returns all plants from the store",
       "parameters": { ... },
-      "responses": { ... },
+      "responses": { ... }
     }
-  }
+  },
+  "/hidden_plants": {
+    "get": {
+      "x-hidden": true,
+      "description": "Returns all somewhat secret plants from the store",
+      "parameters": { ... },
+      "responses": { ... }
+    }
+  },
   "/secret_plants": {
     "get": {
-      "description": "Returns all secret plants from the store (do not publish this endpoint!)",
+      "x-excluded": true,
+      "description": "Returns all top secret plants from the store (do not publish this endpoint!)",
       "parameters": { ... },
-      "responses": { ... },
-      "x-hidden": true
+      "responses": { ... }
     }
   }
 },
 ```
 
-```json {5}
+```json {9, 15}
 "webhooks": {
-  "/secret_pants_hook": {
+  "/plants_hook": {
+    "post": {
+      "description": "Webhook for information about a new plant added to the store",
+    }
+  },
+  "/hidden_plants_hook": {
+    "post": {
+      "x-hidden": true,
+      "description": "Webhook for somewhat secret information about a new plant added to the store"
+    }
+  },
+  "/secret_plants_hook": {
     "post": {
-      "description": "Secret webhook for information about a new plant added to the store",
-      "x-hidden": true
+      "x-excluded": true,
+      "description": "Webhook for top secret information about a new plant added to the store (do not publish this endpoint!)"
     }
   }
 }