[AIRFLOW-XXX] Fix incorrect backticks in BREEZE.rst

[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"
  Doc change

Description

• Here are some details about my PR, including screenshots of any UI changes:
  Fix incorrect backticks in BREEZE.rst

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 #6161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6161   +/-   ##
=======================================
  Coverage   80.09%   80.09%           
=======================================
  Files         606      606           
  Lines       35039    35039           
=======================================
  Hits        28065    28065           
  Misses       6974     6974

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[potiuk]

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