Merge pull request #38050 from p8/guides/command-rails-generate

Don't use rails command shortcuts in guides [ci skip]

guides/source/active_record_migrations.md

@@ -258,7 +258,7 @@ For more `add_reference` options, visit the [API documentation](https://api.ruby
 There is also a generator which will produce join tables if `JoinTable` is part of the name:
 
 ```bash
-$ rails g migration CreateJoinTableCustomerProduct customer product
+$ rails generate migration CreateJoinTableCustomerProduct customer product
 ```
 
 will produce the following migration:

guides/source/active_record_multiple_databases.md

@@ -167,7 +167,7 @@ For example the `animals` database would look in the `db/animals_migrate` direct
 so that the file is generated in the correct directory. The command can be run like so:
 
 ```bash
-$ rails g migration CreateDogs name:string --database animals
+$ rails generate migration CreateDogs name:string --database animals
 ```
 
 ## Activating automatic connection switching

guides/source/autoloading_and_reloading_constants_classic_mode.md

@@ -486,7 +486,7 @@ The value of `autoload_paths` can be inspected. In a just-generated application
 it is (edited):
 
 ```bash
-$ rails r 'puts ActiveSupport::Dependencies.autoload_paths'
+$ rails runner 'puts ActiveSupport::Dependencies.autoload_paths'
 .../app/assets
 .../app/channels
 .../app/controllers
@@ -1226,7 +1226,7 @@ been loaded but `app/models/hotel/image.rb` hasn't, Ruby does not find `Image`
 in `Hotel`, but it does in `Object`:
 
 ```bash
-$ rails r 'Image; p Hotel::Image' 2>/dev/null
+$ rails runner 'Image; p Hotel::Image' 2>/dev/null
 Image # NOT Hotel::Image!
 ```
 

guides/source/engines.md

@@ -202,7 +202,7 @@ within the `Engine` class definition. Without it, classes generated in an engine
 **may** conflict with an application.
 
 What this isolation of the namespace means is that a model generated by a call
-to `rails g model`, such as `rails g model article`, won't be called `Article`, but
+to `rails generate model`, such as `rails generate model article`, won't be called `Article`, but
 instead be namespaced and called `Blorgh::Article`. In addition, the table for the
 model is namespaced, becoming `blorgh_articles`, rather than simply `articles`.
 Similar to the model namespacing, a controller called `ArticlesController` becomes
@@ -845,7 +845,7 @@ of associating the records in the `blorgh_articles` table with the records in th
 To generate this new column, run this command within the engine:
 
 ```bash
-$ rails g migration add_author_id_to_blorgh_articles author_id:integer
+$ rails generate migration add_author_id_to_blorgh_articles author_id:integer
 ```
 
 NOTE: Due to the migration's name and the column specification after it, Rails