Remove references to github repositories.

Denis Brumann · Denis Brumann · commit 33ecc9679056 · 2019-04-06T13:55:18.000+02:00
Fixes #11295 for #EUFOSSA See also PRs #11307 for 4.2 and #11306 for 3.4 for remaining references.
diff --git a/components/mailer.rst b/components/mailer.rst
@@ -14,8 +14,6 @@ Installation
 
     $ composer require symfony/mailer
 
-Alternatively, you can clone the `<https://github.com/symfony/mailer>`_ repository.
-
 .. include:: /components/require_autoload.rst.inc
 
 Usage
diff --git a/components/mime.rst b/components/mime.rst
@@ -16,8 +16,6 @@ Installation
 
     $ composer require symfony/mime
 
-Alternatively, you can clone the `<https://github.com/symfony/mime>`_ repository.
-
 .. include:: /components/require_autoload.rst.inc
 
 Introduction
