fixed variable's spell num_trailing_blanks (#623)

Signed-off-by: lonngxiang <[email protected]>
Co-authored-by: lonngxiang <[email protected]>

python-api-examples/keyword-spotter-from-microphone.py

@@ -163,7 +163,7 @@ def main():
         keywords_file=args.keywords_file,
         keywords_score=args.keywords_score,
         keywords_threshold=args.keywords_threshold,
-        num_tailing_blanks=args.rnum_tailing_blanks,
+        num_trailing_blanks=args.num_trailing_blanks,
         provider=args.provider,
     )