Fix typos in the code of conduct document

[hagau]

PR Prelude

Thank you for working on YCM! :)

Please complete these steps and check these boxes (by putting an x inside
the brackets) before filing your PR:

• I have read and understood YCM's CONTRIBUTING document.
• I have read and understood YCM's CODE_OF_CONDUCT document.
• I have included tests for the changes in my PR. If not, I have included a
  rationale for why I haven't.
• I understand my PR may be closed if it becomes obvious I didn't
  actually perform all of these steps.

Why this change is necessary and useful

The trivial changes improve readability and correctness.

Tests are not included because no code has been changed.

---

This change is 

[bstaletic]

Thanks.

[bstaletic]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: 1 of 2 LGTMs obtained (waiting on @hagau)

[puremourning]

thanks

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 2 of 2 LGTMs obtained (waiting on @hagau)