docs(@angular-devkit/build-angular): update prendering options descriptions

This commit updates several option descriptions

Author: alan-agius4

packages/angular_devkit/build_angular/src/builders/application/schema.json

@@ -426,11 +426,11 @@
           "properties": {
             "routesFile": {
               "type": "string",
-              "description": "The path to a file containing routes separated by newlines."
+              "description": "The path to a file that contains a list of all routes to prerender, separated by newlines. This option is useful if you want to prerender routes with parameterized URLs."
             },
             "discoverRoutes": {
               "type": "boolean",
-              "description": "Whether the builder should discover routers using the Angular Router.",
+              "description": "Whether the builder should process the Angular Router configuration to find all unparameterized routes and prerender them.",
               "default": true
             }
           },

packages/angular_devkit/build_angular/src/builders/prerender/schema.json

@@ -15,7 +15,7 @@
     },
     "routesFile": {
       "type": "string",
-      "description": "The path to a file containing routes separated by newlines."
+      "description": "The path to a file that contains a list of all routes to prerender, separated by newlines. This option is useful if you want to prerender routes with parameterized URLs."
     },
     "routes": {
       "type": "array",
@@ -29,7 +29,7 @@
     },
     "discoverRoutes": {
       "type": "boolean",
-      "description": "Whether the builder should discover routers using the Angular Router.",
+      "description": "Whether the builder should process the Angular Router configuration to find all unparameterized routes and prerender them.",
       "default": true
     }
   },