Add comments for TLS config create functions.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.30%. Comparing base (05bc265) to head (02e130c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #309 +/- ## ======================================== Coverage 95.29% 95.30% ======================================== Files 50 50 Lines 33598 33598 ======================================== + Hits 32017 32019 +2 + Misses 1581 1579 -2 ```

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