remove scatter-update-limit-passthru from help text files

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>
Signed-off-by: Tanjin Xu <tanjin.xu@slack-corp.com>

Author: tanjinx

go/flags/endtoend/vtcombo.txt

@@ -329,7 +329,6 @@ Flags:
       --restore_from_backup_ts string                                    (init restore parameter) if set, restore the latest backup taken at or before this timestamp. Example: '2021-04-29.133050'
       --retain_online_ddl_tables duration                                How long should vttablet keep an old migrated table before purging it (default 24h0m0s)
       --sanitize_log_messages                                            Remove potentially sensitive information in tablet INFO, WARNING, and ERROR log messages such as query parameters.
-      --scatter-update-limit-passthru                                    When enabled, multi-shard UPDATE/DELETE with LIMIT on non-scatter routes (e.g. IN clause on vindex) will push LIMIT to each shard instead of requiring schema tracking for DMLWithInput.
       --schema-change-reload-timeout duration                            query server schema change reload timeout, this is how long to wait for the signaled schema reload operation to complete before giving up (default 30s)
       --schema-version-max-age-seconds int                               max age of schema version records to kept in memory by the vreplication historian
       --schema_change_signal                                             Enable the schema tracker; requires queryserver-config-schema-change-signal to be enabled on the underlying vttablets for this to work (default true)

go/flags/endtoend/vtgate.txt

@@ -188,7 +188,6 @@ Flags:
       --redact-debug-ui-queries                                          redact full queries and bind variables from debug UI
       --remote_operation_timeout duration                                time to wait for a remote operation (default 15s)
       --retry-count int                                                  retry count (default 2)
-      --scatter-update-limit-passthru                                    When enabled, multi-shard UPDATE/DELETE with LIMIT on non-scatter routes (e.g. IN clause on vindex) will push LIMIT to each shard instead of requiring schema tracking for DMLWithInput.
       --schema_change_signal                                             Enable the schema tracker; requires queryserver-config-schema-change-signal to be enabled on the underlying vttablets for this to work (default true)
       --security_policy string                                           the name of a registered security policy to use for controlling access to URLs - empty means allow all for anyone (built-in policies: deny-all, read-only)
       --service_map strings                                              comma separated list of services to enable (or disable if prefixed with '-') Example: grpc-queryservice