[AIRFLOW-XXX] Fix Documentation for adding extra Operator Links

[kaxil]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-XXX

Description

• Here are some details about my PR, including screenshots of any UI changes:
  [AIRFLOW-4306] Global operator extra links #5094 updated the code but maybe forgot to update this docs

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  Doc change

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

[codecov-io]

Codecov Report

Merging #6301 into master will decrease coverage by 70.9%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #6301       +/-   ##
==========================================
- Coverage   80.41%    9.5%   -70.91%     
==========================================
  Files         612     612               
  Lines       35473   35473               
==========================================
- Hits        28524    3372    -25152     
- Misses       6949   32101    +25152

Impacted Files	Coverage Δ
...low/contrib/operators/wasb_delete_blob_operator.py	0% <0%> (-100%)	⬇️
airflow/example_dags/subdags/subdag.py	0% <0%> (-100%)	⬇️
airflow/gcp/sensors/bigquery_dts.py	0% <0%> (-100%)	⬇️
airflow/gcp/operators/text_to_speech.py	0% <0%> (-100%)	⬇️
airflow/contrib/sensors/emr_base_sensor.py	0% <0%> (-100%)	⬇️
airflow/gcp/hooks/discovery_api.py	0% <0%> (-100%)	⬇️
airflow/contrib/operators/gcs_list_operator.py	0% <0%> (-100%)	⬇️
airflow/example_dags/example_subdag_operator.py	0% <0%> (-100%)	⬇️
airflow/contrib/operators/file_to_gcs.py	0% <0%> (-100%)	⬇️
airflow/gcp/hooks/kms.py	0% <0%> (-100%)	⬇️
... and 500 more

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