Merge branch '4.3' into 4.4

* 4.3:
  use a lovercase title for the link. refs #12638
  fix supported installable version formats
  Fix broken link for multiple messenger buses
  remove gender-related terms from HTTP fundamentals diagrams

Author: OskarStark

_images/http/xkcd-full.png

@@ -6,7 +6,7 @@ Transactional Messages: Handle New Messages After Handling is Done
 
 A message handler can ``dispatch`` new messages during execution, to either the
 same or a different bus (if the application has
-`multiple buses </messenger/multiple_buses>`_). Any errors or exceptions that
+:doc:`multiple buses </messenger/multiple_buses>`). Any errors or exceptions that
 occur during this process can have unintended consequences, such as:
 
 - If using the ``DoctrineTransactionMiddleware`` and a dispatched message throws

_images/http/xkcd-request.png

@@ -243,10 +243,6 @@ stable version. If you want to use an LTS version, add the ``--version`` option:
     # use the 'next' Symfony version to be released (still in development)
     $ symfony new my_project_name --version=next
 
-    #  use a specific Symfony version
-    $ symfony new my_project_name --version=3.3.10
-    $ symfony new my_project_name --version=4.3.1
-
 The Symfony Demo application
 ----------------------------