move flag to Configuration section

Signed-off-by: deepthi <deepthi@planetscale.com>

doc/releasenotes/7_0_1_release_notes.md

@@ -1,6 +1,9 @@
 This update fixes several regressions that were deemed significant enough to be backported to the release branch.
 In addition, the experimental feature to set system variables is now behind a flag that disables it by default.
 
+## Configuration Changes
+* Vtgate: added flag enable_system_settings to enable passthrough system settings, defaults to false #6562
+
 ## Bugs Fixed
 * Vtctld UI: mysql port is not displayed in tablet list #6597 #6600
 * Vtgate: transaction killer was closing reserved connection after the specified time. Only idle connections should be closed. Idle transactions should be rolled back. #6583
@@ -8,7 +11,6 @@ In addition, the experimental feature to set system variables is now behind a fl
 * Vreplication: tablet_picker should respect canceled context. Also, keep trying to find a tablet until context expires. #6567
 * Vtgate: vindex update/delete by destination #6541 #6572
 * Vtgate: some usages of EXPLAIN were broken #6574 #6581
-* Vtgate: flag to disable passthrough system settings, default to false #6562
 * Vtgate: handle multiple settings in single SET statement #6504
 * Vtgate: cleanup shard session for reserved connection on failure #6563
 * Vtgate: if executing DDL on reserved connection, start transaction if needed #6555