Improve deprecation for hash key mapping in routing

Related with rails#52422.

Author: rafaelfranca

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -470,7 +470,7 @@ module Base
         # When a pattern points to an internal route, the route's `:action` and
         # `:controller` should be set in options or hash shorthand. Examples:
         #
-        #     match 'photos/:id' => 'photos#show', via: :get
+        #     match 'photos/:id', to: 'photos#show', via: :get
         #     match 'photos/:id', to: 'photos#show', via: :get
         #     match 'photos/:id', controller: 'photos', action: 'show', via: :get
         #
@@ -614,18 +614,14 @@ def match(path, options = nil)
         #
         #     mount SomeRackApp, at: "some_route"
         #
-        # Alternatively:
-        #
-        #     mount(SomeRackApp => "some_route")
-        #
         # For options, see `match`, as `mount` uses it internally.
         #
         # All mounted applications come with routing helpers to access them. These are
         # named after the class specified, so for the above example the helper is either
         # `some_rack_app_path` or `some_rack_app_url`. To customize this helper's name,
         # use the `:as` option:
         #
-        #     mount(SomeRackApp => "some_route", as: "exciting")
+        #     mount(SomeRackApp, at: "some_route", as: "exciting")
         #
         # This will generate the `exciting_path` and `exciting_url` helpers which can be
         # used to navigate to this mounted app.
@@ -649,7 +645,15 @@ def mount(app, options = nil)
           MSG
           ActionDispatch.deprecator.warn(<<-MSG.squish) if hash_key_app
             Mounting an engine with a hash key name is deprecated and
-            will be removed in Rails 8.1. Please use the at: option instead.
+            will be removed in Rails 8.1. Please use the `at:` option instead.
+
+            Instead of:
+
+              mount(SomeRackApp => "some_route")
+
+            Please use:
+
+              mount SomeRackApp, at: "some_route"
           MSG
 
           rails_app = rails_app? app
@@ -1677,7 +1681,6 @@ def draw(name)
         # Matches a URL pattern to one or more routes. For more information, see
         # [match](rdoc-ref:Base#match).
         #
-        #     match 'path' => 'controller#action', via: :patch
         #     match 'path', to: 'controller#action', via: :post
         #     match 'path', 'otherpath', on: :member, via: :get
         def match(path, *rest, &block)
@@ -1689,8 +1692,16 @@ def match(path, *rest, &block)
 
             ActionDispatch.deprecator.warn(<<-MSG.squish)
               Drawing a route with a hash key name is deprecated and
-              will be removed in Rails 8.1. Please use the to: option with
+              will be removed in Rails 8.1. Please use the `to:` option with
               "controller#action" syntax instead.
+
+              Instead of:
+
+                match "path" => "controller#action`
+
+              Please use:
+
+                match "path", to: "controller#action"
             MSG
 
             case to