Add *_check_constraint actions to Migrations guide [ci-skip]

Closes rails#45356.

Co-authored-by: Nataliya Terskaya <[email protected]>

Author: jonathanhefner

guides/source/active_record_migrations.md

@@ -606,6 +606,7 @@ The `change` method is the primary way of writing migrations. It works for the
 majority of cases in which Active Record knows how to reverse a migration's
 actions automatically. Below are some of the actions that `change` supports:
 
+* [`add_check_constraint`][]
 * [`add_column`][]
 * [`add_foreign_key`][]
 * [`add_index`][]
@@ -621,6 +622,7 @@ actions automatically. Below are some of the actions that `change` supports:
 * [`drop_join_table`][]
 * [`drop_table`][] (must supply a block)
 * `enable_extension`
+* [`remove_check_constraint`][] (must supply a constraint expression)
 * [`remove_column`][] (must supply a type)
 * [`remove_foreign_key`][] (must supply a second table)
 * [`remove_index`][]
@@ -644,12 +646,14 @@ remove_column :posts, :slug, :string, null: false, default: ''
 If you're going to need to use any other methods, you should use `reversible`
 or write the `up` and `down` methods instead of using the `change` method.
 
+[`add_check_constraint`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_check_constraint
 [`add_foreign_key`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_foreign_key
 [`add_timestamps`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_timestamps
 [`change_column_comment`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-change_column_comment
 [`change_table_comment`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-change_table_comment
 [`drop_join_table`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-drop_join_table
 [`drop_table`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-drop_table
+[`remove_check_constraint`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-remove_check_constraint
 [`remove_foreign_key`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-remove_foreign_key
 [`remove_index`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-remove_index
 [`remove_reference`]: https://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-remove_reference