ExploitationConfiguration docstring

[shreyamalviya]

What does this PR do?

Fixes a part of #2004

PR Checklist

• Have you added an explanation of what your changes do and why you'd like to include them?
• Is the TravisCI build passing?
• Was the CHANGELOG.md updated to reflect the changes?
• Was the documentation framework updated to reflect the changes?
• Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• Added relevant unit tests?
• Have you successfully tested your changes locally? Elaborate:

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• If applicable, add screenshots or log transcripts of the feature working

[codecov]

Codecov Report

Merging #2128 (fa98631) into develop (643896b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #2128   +/-   ##
========================================
  Coverage    56.64%   56.64%           
========================================
  Files          486      486           
  Lines        13227    13227           
========================================
  Hits          7493     7493           
  Misses        5734     5734           

Impacted Files	Coverage Δ
...on/agent_configuration/agent_sub_configurations.py	100.00% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 643896b...fa98631. Read the comment docs.