Remove unused region_tag comment. [(#3075)](#3075)

Author: jsimonweb

language/snippets/generated-samples/v1/language_sentiment_text.py

@@ -29,7 +29,6 @@
 
 
 def sample_analyze_sentiment(content):
-    # [START language_sentiment_text_core]
 
     client = language_v1.LanguageServiceClient()
 
@@ -46,8 +45,6 @@ def sample_analyze_sentiment(content):
     print('Score: {}'.format(sentiment.score))
     print('Magnitude: {}'.format(sentiment.magnitude))
 
-    # [END language_sentiment_text_core]
-
 
 # [END language_sentiment_text]