update docs

Author: jasonwbarnett

Diff for: docs/source/settings.rst

@@ -443,7 +443,7 @@ Address is a string of the form:
 **Default:** ``''``
 
 A comma-delimited list of datadog statsd (dogstatsd) tags to append to
-statsd metrics.
+statsd metrics. e.g. 'tag1:value1,tag2:value2'
 
 .. versionadded:: 20
 

Diff for: gunicorn/config.py

@@ -1672,7 +1672,7 @@ class DogstatsdTags(Setting):
     validator = validate_string
     desc = """\
     A comma-delimited list of datadog statsd (dogstatsd) tags to append to
-    statsd metrics.
+    statsd metrics. e.g. 'tag1:value1,tag2:value2'
 
     .. versionadded:: 20
     """