Fixed typo in comment

[libremente]

Just a typo fix in a comment.

[openedx-webhooks]

Thanks for the pull request, @libremente! I've created OSPR-1718 to keep track of it in JIRA. JIRA is a place for product owners to prioritize feature reviews by the engineering development teams.

Feel free to add as much of the following information to the ticket:

• supporting documentation
• edx-code email threads
• timeline information ("this must be merged by XX date", and why that is)
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• any other information that can help Product understand the context for the PR

All technical communication about the code itself will still be done via the GitHub pull request interface. As a reminder, our process documentation is here.

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[codecov-io]

Codecov Report

Merging #364 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #364   +/-   ##
=======================================
  Coverage   93.78%   93.78%           
=======================================
  Files          36       36           
  Lines        4261     4261           
  Branches      290      290           
=======================================
  Hits         3996     3996           
  Misses        216      216           
  Partials       49       49

Impacted Files	Coverage Δ
xblock/plugin.py	93.58% <ø> (ø)	⬆️

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