refactor: update app option description & link in schema (#5198)

Author: snitin315

lib/options.json

@@ -4,8 +4,8 @@
   "definitions": {
     "App": {
       "instanceof": "Function",
-      "description": "Allows to use custom applications (i.e. 'connect', 'fastify' and etc).",
-      "link": " https://webpack.js.org/configuration/dev-server/#devserverapp"
+      "description": "Allows to use custom applications, such as 'connect', 'fastify', etc.",
+      "link": "https://webpack.js.org/configuration/dev-server/#devserverapp"
     },
     "AllowedHosts": {
       "anyOf": [

test/__snapshots__/validate-options.test.js.snap.webpack5

@@ -55,15 +55,15 @@ exports[`options validate should throw an error on the "allowedHosts" option wit
 exports[`options validate should throw an error on the "app" option with 'false' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.app should be an instance of function.
-   -> Allows to use custom applications (i.e. 'connect', 'fastify' and etc).
-   -> Read more at  https://webpack.js.org/configuration/dev-server/#devserverapp"
+   -> Allows to use custom applications, such as 'connect', 'fastify', etc.
+   -> Read more at https://webpack.js.org/configuration/dev-server/#devserverapp"
 `;
 
 exports[`options validate should throw an error on the "app" option with 'test' value 1`] = `
 "ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
  - options.app should be an instance of function.
-   -> Allows to use custom applications (i.e. 'connect', 'fastify' and etc).
-   -> Read more at  https://webpack.js.org/configuration/dev-server/#devserverapp"
+   -> Allows to use custom applications, such as 'connect', 'fastify', etc.
+   -> Read more at https://webpack.js.org/configuration/dev-server/#devserverapp"
 `;
 
 exports[`options validate should throw an error on the "bonjour" option with '' value 1`] = `