AUDIT_GUID - Availability Group scenario (#9930)

* AUDIT_GUID - Availability Group scenario

Whilst database mirroring is one of the underlying technologies used in Availability Groups, highlighting this for others that may not realise.

* Update docs/t-sql/statements/create-server-audit-transact-sql.md

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Co-authored-by: Masha Thomas (MSFT) <[email protected]>

Author: Kevin-S-Lewis

docs/t-sql/statements/create-server-audit-transact-sql.md

@@ -129,7 +129,7 @@ Database actions fail if they cause audited events. Actions, which don't cause a
 
 #### AUDIT_GUID = *uniqueidentifier*
 
-To support scenarios such as database mirroring, an audit needs a specific GUID that matches the GUID found in the mirrored database. The GUID can't be modified after the audit is created.
+To support scenarios such as database mirroring or databases participating in an Always On availability group, an audit needs a specific GUID that matches the GUID found in the mirrored database. The GUID can't be modified after the audit is created.
 
 #### OPERATOR_AUDIT