Update the statsd config example

[FlorentClarret]

What does this PR do?

Update the statsd config example so the comments are not on the same line as the properties.

Motivation

Support case. Running airflow using this config:

Traceback (most recent call last):
  File "/usr/local/bin/airflow", line 25, in <module>
    from airflow.configuration import conf
  File "/usr/local/lib/python3.8/site-packages/airflow/__init__.py", line 31, in <module>
    from airflow.utils.log.logging_mixin import LoggingMixin
  File "/usr/local/lib/python3.8/site-packages/airflow/utils/__init__.py", line 24, in <module>
    from .decorators import apply_defaults as _apply_defaults
  File "/usr/local/lib/python3.8/site-packages/airflow/utils/decorators.py", line 36, in <module>
    from airflow import settings
  File "/usr/local/lib/python3.8/site-packages/airflow/settings.py", line 121, in <module>
    port=conf.getint('scheduler', 'statsd_port'),
  File "/usr/local/lib/python3.8/site-packages/airflow/configuration.py", line 418, in getint
    return int(self.get(section, key, **kwargs))
ValueError: invalid literal for int() with base 10: '8125       # DogStatsD port configured in the Datadog Agent'

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

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[FlorentClarret]

Customer also confirmed this was their problem. Merging