Merge pull request #24188 from thesqlsith/patch-10

Update rtrim-transact-sql.md

Author: prmerger-automator[bot]

docs/t-sql/functions/rtrim-transact-sql.md

@@ -46,6 +46,9 @@ RTRIM ( character_expression )
 ::: moniker range=">=sql-server-ver16 || >=sql-server-linux-ver16"
 Syntax for [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later:
 
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the optional `characters` argument.
+
 ```syntaxsql
 RTRIM ( character_expression , [ characters ] )
 ```
@@ -125,6 +128,9 @@ Four spaces are after the period in this sentence. Next string.
 
 ### C. Remove specified characters from the end of a string
 
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the optional `characters` argument.
+
 The following example removes the characters `abc.` from the end of the `.123abc.` string.
 
 ```sql