Fixed prefixes on comments.

[mbobrovskyi]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Regarding https://go.dev/wiki/CodeReviewComments#comment-sentences suggestion, comments should begin with the name of the thing being described and end in a period.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE