planner: update the fix-control doc (#19520) (#19674)

optimizer-fix-controls.md

@@ -63,4 +63,16 @@ SET SESSION tidb_opt_fix_control = '44262:ON,44389:ON';
 - Default value: `1000`
 - Possible values: `[0, 2147483647]`
 - This variable sets the threshold for the optimizer's heuristic strategy to select access paths. If the estimated rows for an access path (such as `Index_A`) is much smaller than that of other access paths (default `1000` times), the optimizer skips the cost comparison and directly selects `Index_A`.
-- `0` means to disable this heuristic strategy.
+- `0` means to disable this heuristic strategy.
+
+### [`45798`](https://github.com/pingcap/tidb/issues/45798) <span class="version-mark">New in v7.5.0</span>
+
+- Default value: `ON`
+- Possible values: `ON`, `OFF`
+- This variable controls whether Plan Cache is allowed to cache execution plans that access [generated columns](/generated-columns.md).
+
+### [`46177`](https://github.com/pingcap/tidb/issues/46177) <span class="version-mark">New in v6.5.6, v7.1.3 and v7.5.0</span>
+
+- Default value: `ON`
+- Possible values: `ON`, `OFF`
+- This variable controls whether the optimizer explores enforced plans during query optimization after finding an unenforced plan.