sanitycheck: fix --jobs help message + other cosmetic fixes

The --jobs default was recently changed in commit 9f4f57eed3, update
its help message.

Add the hopefully last missing verbose("Spawning...") statement.

Fix comment updated in commit 095b82a301.

Replace two tags with whitespace.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>

scripts/sanitycheck

@@ -816,8 +816,8 @@ class QEMUHandler(Handler):
                     out_state = harness.state
 
                 # if we get some state, that means test is doing well, we reset
-                # the timeout and wait for 2 more seconds just in case we have
-                # crashed after test has completed. We wait longer if code
+                # the timeout and wait for 2 more seconds to catch anything
+                # printed late. We wait much longer if code
                 # coverage is enabled since dumping this information can
                 # take some time.
                 if not timeout_extended or harness.capture_coverage:
@@ -1275,6 +1275,7 @@ class MakeGenerator:
             handler = QEMUHandler(instance, "qemu")
         elif type == "native":
             handler = BinaryHandler(instance, "native")
+            # defined by __build_dir in cmake/boilerplate.cmake
             handler.binary = os.path.join(outdir, "zephyr", "zephyr.exe")
             if options.enable_coverage:
                 args += ["EXTRA_LDFLAGS=--coverage"]
@@ -1395,6 +1396,8 @@ class MakeGenerator:
             # assure language neutral environment
             make_env = os.environ.copy()
             make_env['LC_MESSAGES'] = 'C.UTF-8'
+            verbose("In %s, spawning: " % os.getcwd()
+                    + " ".join(shlex.quote(word)for word in cmd))
             p = subprocess.Popen(cmd, stderr=subprocess.PIPE,
                                  stdout=devnull, env=make_env)
 
@@ -2908,8 +2911,8 @@ Artificially long but functional example:
 
     parser.add_argument(
         "-j", "--jobs", type=int,
-        help="Number of jobs for building, defaults to number of CPU threads "
-        "overcommited by factor 2")
+        help="Number of jobs for building, defaults to number of CPU threads, "
+        "overcommited by factor 2 when --build-only")
 
     parser.add_argument(
         "--device-testing", action="store_true",
@@ -2921,7 +2924,7 @@ Artificially long but functional example:
         help="Specify a fixture that a board might support")
     parser.add_argument(
         "--device-serial",
-		help="Serial device for accessing the board (e.g., /dev/ttyACM0)")
+        help="Serial device for accessing the board (e.g., /dev/ttyACM0)")
     parser.add_argument(
             "--show-footprint", action="store_true",
             help="Show footprint statistics and deltas since last release."