TV Shows: Document "Specials in Seasons" feature

docs/general/server/media/shows.md

@@ -68,6 +68,14 @@ Episode numbering for specials may vary from metadata provider to metadata provi
 
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+Specials can also be shown within a Season if so desired. This can be helpful when they are part of a continued storyline during the Season. This requires 2 settings:
+
+1. The option under Dashboard -> Library -> Display -> "Display specials within their series they aired in" must be enabled
+2. The Season and Episode they aired before/after must be set within the metadata.
+    * These can be set in the Metadata editor or in an NFO using the `airsbefore_season`, `airsafter_season`, and `airsbefore_episode` tags.
+
+Note that this will show them in both the `Specials` Season, as well as the Season specified.
+
 ## Episodes Split Across Multiple Parts
 
 Episodes that are split into multiple files can be stacked together if named correctly. Files should be named as follows: