Issue #2985346 by ifrik, marcoscano: Edit Media modules descriptions to follow...

Issue #2985346 by ifrik, marcoscano: Edit Media modules descriptions to follow the UI text standards

core/modules/media/media.info.yml

 name: Media
-description: 'Create reusable media.'
+description: 'Manages the creation, configuration of display of media items.'
 type: module
 package: Core
 version: VERSION

core/modules/media_library/media_library.info.yml

 name: 'Media library'
 type: module
-description: 'Provides a library for re-using Media Items.'
+description: 'Enhances the media list with additional features to easier find and use existing media items.'
 package: Core (Experimental)
 version: VERSION
 core: 8.x