fix: update description of onAfterSetupMiddleware and onBeforeSetupMiddleware options (#4126)

Author: snitin315

lib/options.json

@@ -486,12 +486,12 @@
     },
     "OnAfterSetupMiddleware": {
       "instanceof": "Function",
-      "description": "Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares.",
+      "description": "Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares. Deprecated: please use the 'setupMiddlewares' option.",
       "link": "https://webpack.js.org/configuration/dev-server/#devserveronaftersetupmiddleware"
     },
     "OnBeforeSetupMiddleware": {
       "instanceof": "Function",
-      "description": "Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares.",
+      "description": "Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares. Deprecated: please use the 'setupMiddlewares' option.",
       "link": "https://webpack.js.org/configuration/dev-server/#devserveronbeforesetupmiddleware"
     },
     "OnListening": {

test/__snapshots__/validate-options.test.js.snap.webpack4

@@ -484,14 +484,14 @@ exports[`options validate should throw an error on the "magicHtml" option with '
 exports[`options validate should throw an error on the "onAfterSetupMiddleware" 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.onAfterSetupMiddleware should be an instance of function.
-   -> Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares.
+   -> Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares. Deprecated: please use the 'setupMiddlewares' option.
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserveronaftersetupmiddleware"
 `;
 
 exports[`options validate should throw an error on the "onBeforeSetupMiddleware" 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.onBeforeSetupMiddleware should be an instance of function.
-   -> Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares.
+   -> Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares. Deprecated: please use the 'setupMiddlewares' option.
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserveronbeforesetupmiddleware"
 `;
 

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

@@ -484,14 +484,14 @@ exports[`options validate should throw an error on the "magicHtml" option with '
 exports[`options validate should throw an error on the "onAfterSetupMiddleware" 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.onAfterSetupMiddleware should be an instance of function.
-   -> Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares.
+   -> Provides the ability to execute a custom function and apply custom middleware(s) after all other middlewares. Deprecated: please use the 'setupMiddlewares' option.
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserveronaftersetupmiddleware"
 `;
 
 exports[`options validate should throw an error on the "onBeforeSetupMiddleware" 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.onBeforeSetupMiddleware should be an instance of function.
-   -> Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares.
+   -> Provides the ability to execute a custom function and apply custom middleware(s) prior to all other middlewares. Deprecated: please use the 'setupMiddlewares' option.
    -> Read more at https://webpack.js.org/configuration/dev-server/#devserveronbeforesetupmiddleware"
 `;