sync: clarify job flags when using interleaved

--jobs-network and --jobs-checkout are ignored with --interleaved.

Bug: 421935613
Change-Id: Ib69413993c4f970b385bd09318972716e5ac3324
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/485021
Tested-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Scott Lee <ddoman@google.com>

Author: gavinmak

man/repo-smartsync.1

@@ -20,11 +20,12 @@ number of CPU cores)
 .TP
 \fB\-\-jobs\-network\fR=\fI\,JOBS\/\fR
 number of network jobs to run in parallel (defaults to
-\fB\-\-jobs\fR or 1)
+\fB\-\-jobs\fR or 1). Ignored when \fB\-\-interleaved\fR is set
 .TP
 \fB\-\-jobs\-checkout\fR=\fI\,JOBS\/\fR
 number of local checkout jobs to run in parallel
-(defaults to \fB\-\-jobs\fR or 8)
+(defaults to \fB\-\-jobs\fR or 8). Ignored when \fB\-\-interleaved\fR
+is set
 .TP
 \fB\-f\fR, \fB\-\-force\-broken\fR
 obsolete option (to be deleted in the future)

man/repo-sync.1

@@ -20,11 +20,12 @@ number of CPU cores)
 .TP
 \fB\-\-jobs\-network\fR=\fI\,JOBS\/\fR
 number of network jobs to run in parallel (defaults to
-\fB\-\-jobs\fR or 1)
+\fB\-\-jobs\fR or 1). Ignored when \fB\-\-interleaved\fR is set
 .TP
 \fB\-\-jobs\-checkout\fR=\fI\,JOBS\/\fR
 number of local checkout jobs to run in parallel
-(defaults to \fB\-\-jobs\fR or 8)
+(defaults to \fB\-\-jobs\fR or 8). Ignored when \fB\-\-interleaved\fR
+is set
 .TP
 \fB\-f\fR, \fB\-\-force\-broken\fR
 obsolete option (to be deleted in the future)

subcmds/sync.py

@@ -411,15 +411,16 @@ def _Options(self, p, show_smart=True):
             type=int,
             metavar="JOBS",
             help="number of network jobs to run in parallel (defaults to "
-            "--jobs or 1)",
+            "--jobs or 1). Ignored when --interleaved is set",
         )
         p.add_option(
             "--jobs-checkout",
             default=None,
             type=int,
             metavar="JOBS",
             help="number of local checkout jobs to run in parallel (defaults "
-            f"to --jobs or {DEFAULT_LOCAL_JOBS})",
+            f"to --jobs or {DEFAULT_LOCAL_JOBS}). Ignored when --interleaved "
+            "is set",
         )
 
         p.add_option(