Bump sphinxcontrib-spelling and minor improvements (#16675)

- Bump `sphinxcontrib-spelling` from `5.2.1` to `7.2.1`
- Excludes `project.rst` and `changelog.rst` from spell-check for `apache-airflow` package so that we don't need to add Committer's Name everytime.
- Removes committers name and ``'airfl%'`` from `docs/spelling_wordlist.txt` as it isn't needed. It should be a code-block not an actual word.

(cherry picked from commit 3a57d9f)

CHANGELOG.txt

@@ -1,4 +1,4 @@
-Airflow 2.1.3, 2021-08-23
+Airflow 2.1.3, 2021-08-21
 -------------------------
 
 Bug Fixes
@@ -32,7 +32,7 @@ Bug Fixes
 - fix(smart_sensor): Unbound variable errors (#14774)
 - Add back missing permissions to ``UserModelView`` controls. (#17431)
 - Better diagnostics and self-healing of docker-compose (#17484)
-- Improve diagnostics message when users have ``secret_key`` mis-configured (#17410)
+- Improve diagnostics message when users have ``secret_key`` misconfigured (#17410)
 - Stop checking ``execution_date`` in ``task_instance.refresh_from_db`` (#16809)
 
 Improvements

airflow/providers/amazon/aws/sensors/s3_prefix.py

@@ -24,8 +24,8 @@
 class S3PrefixSensor(BaseSensorOperator):
     """
     Waits for a prefix to exist. A prefix is the first part of a key,
-    thus enabling checking of constructs similar to glob airfl* or
-    SQL LIKE 'airfl%'. There is the possibility to precise a delimiter to
+    thus enabling checking of constructs similar to glob ``airfl*`` or
+    SQL LIKE ``'airfl%'``. There is the possibility to precise a delimiter to
     indicate the hierarchy or keys, meaning that the match will stop at that
     delimiter. Current code accepts sane delimiters, i.e. characters that
     are NOT special characters in the Python regex engine.

docs/conf.py

@@ -633,6 +633,9 @@ def _get_params(root_schema: dict, prefix: str = "", default_section: str = "")
 
 # -- Options for sphinxcontrib-spelling ----------------------------------------
 spelling_word_list_filename = [os.path.join(CONF_DIR, 'spelling_wordlist.txt')]
+if PACKAGE_NAME == 'apache-airflow':
+    spelling_exclude_patterns = ['project.rst', 'changelog.rst']
+spelling_ignore_contributor_names = False
 
 # -- Options for sphinxcontrib.redoc -------------------------------------------
 # See: https://sphinxcontrib-redoc.readthedocs.io/en/stable/