typo-ish: improved comment that indicates state of Barrier

[cpriyank]

removed extra comma in comment that indicates state of a Barrier as it was confusing and breaking the flow while reading. Also added missing space after # that began the comment

[the-knights-who-say-ni]

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[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[serverwentdown]

LGTM, erroneous extra comma in code comment.

[eamanu]

I'm not sure about a new commit for only for this change.

We can take in advantage some other bugs to fix this.

Also @cpriyank don't forget sign the CLA.

[ambv]

Closing in favor of GH-28623.