[lldb/crashlog] Update incorrect help message for --no-crashed-only option (#91162)

This patch rephrases the crashlog `--no-crashed-only` option help
message. This option is mainly used in batch mode to symbolicate and
dump all the threads backtraces, instead of only doing it for the
crashed thread which is the default behavior.

rdar://127391524

Signed-off-by: Med Ismail Bennani <[email protected]>

Author: medismailben

lldb/examples/python/crashlog.py

@@ -1649,7 +1649,8 @@ def CreateSymbolicateCrashLogOptions(
         "--no-crashed-only",
         action="store_false",
         dest="crashed_only",
-        help="do not symbolicate the crashed thread",
+        help="in batch mode, symbolicate all threads, not only the crashed one",
+        default=False,
     )
     arg_parser.add_argument(
         "--disasm-depth",