chore: fix spelling

* a
* acceleration
* addition
* altogether
* api clients
* artist
* associated
* bandwidth
* cannot
* capabilities
* case-insensitive
* case-sensitive
* configuration
* delimiter
* dependent
* diacritics
* directors
* enable
* explicitly
* filters
* finish
* have
* hierarchy
* implicit
* include
* information
* into
* its
* keepalive
* localization
* macos
* manual
* matching
* metadata
* nonexistent
* options
* overridden
* parsed
* parser
* playback
* preferring
* processes
* processing
* provider
* ratings
* retrieval
* running
* segments
* separate
* should
* station
* subdirectories
* superseded
* supported
* system
* than
* the
* throws
* transpose
* valid
* was

link: forum or chat rooms

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

MediaBrowser.Controller/Library/IMediaSourceManager.cs

@@ -53,7 +53,7 @@ namespace MediaBrowser.Controller.Library
         IReadOnlyList<MediaAttachment> GetMediaAttachments(MediaAttachmentQuery query);
 
         /// <summary>
-        /// Gets the playack media sources.
+        /// Gets the playback media sources.
         /// </summary>
         /// <param name="item">Item to use.</param>
         /// <param name="user">User to use for operation.</param>