This doesn't look too great because the icons aren't centred (and have different widths):
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Description
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Revisions and Commits
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The problem is we'd never ship those icons specifically because they are bad choices for visualizing information. If you want to submit a fix, that's fine, but I don't understand why you're asking us to make your UI look better.
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You're welcome to submit a fix, I don't anticipate revisiting this component for some time. For the most part, most icon stacks are aligned on the left edge in Phabricator, but it's not consistent and at some point we have to move on to the next project.