Merge branch '4.4' into 5.2

* 4.4:
  CI: Add new rule for DOCtor-RST
  Fix link to Composer

Author: OskarStark

.doctor-rst.yaml

@@ -8,6 +8,7 @@ rules:
     correct_code_block_directive_based_on_the_content: ~
     deprecated_directive_should_have_version: ~
     ensure_exactly_one_space_between_link_definition_and_link: ~
+    ensure_link_definition_contains_valid_url: ~
     ensure_order_of_code_blocks_in_configuration_block: ~
     extend_abstract_controller: ~
     extension_xlf_instead_of_xliff: ~

create_framework/introduction.rst

@@ -64,7 +64,7 @@ Reading about how to create a framework is not enough. You will have to follow
 along and actually type all the examples included in this tutorial. For that,
 you need a recent version of PHP (7.4 or later is good enough), a web server
 (like Apache, nginx or PHP's built-in web server), a good knowledge of PHP and
-an understanding of Object Oriented programming.
+an understanding of Object Oriented Programming.
 
 Ready to go? Read on!
 
@@ -113,5 +113,5 @@ In the :doc:`next chapter </create_framework/http_foundation>`, we are going to
 introduce the HttpFoundation Component and see what it brings us.
 
 .. _`Symfony`: https://symfony.com/
-.. _`Composer`: https//getcomposer.org/
+.. _`Composer`: https://getcomposer.org/
 .. _`download and install Composer`: https://getcomposer.org/download/