Update trim-transact-sql.md

@rwestMSFT

Author: thesqlsith

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

@@ -41,6 +41,9 @@ TRIM ( [ characters FROM ] string )
 ::: moniker-end
 
 ::: moniker range=">=sql-server-ver16 || >=sql-server-linux-ver16"
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the LEADING, TRAILING, or BOTH keywords.
+
 Syntax for [!INCLUDE [sssql22-md](../../includes/sssql22-md.md)] and later:
 
 ```syntaxsql
@@ -136,6 +139,8 @@ In this example, only the trailing period and spaces from before `#` and after t
 ::: moniker range=">=sql-server-ver16 || >=sql-server-linux-ver16"
 
 ### C. Remove specified characters from the start of a string
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the LEADING, TRAILING, or BOTH keywords.
 
 The following example removes the leading `.` from the start of the string before the word `test`.
 
@@ -150,6 +155,8 @@ SELECT TRIM(LEADING '.,! ' FROM  '     .#     test    .') AS Result;
 ```
 
 ### D. Remove specified characters from the end of a string
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the LEADING, TRAILING, or BOTH keywords.
 
 The following example removes the trailing `.` from the end of the string after the word `test`.
 
@@ -164,6 +171,8 @@ SELECT TRIM(TRAILING '.,! ' FROM '     .#     test    .') AS Result;
 ```
 
 ### E. Remove specified characters from the beginning and end of a string
+> [!IMPORTANT]
+> You will need your database compatibility level set to 160 to use the LEADING, TRAILING, or BOTH keywords.
 
 The following example removes the characters `123` from the beginning and end of the string `123abc123`.