Settings: Spacing/font-size on some cards is off

[beaulebens]

• Weird spacing at the top of the card should be consistent with others (this space looks too big, I think because the first tag is a p, and they have top and bottom margins currently).

font-size is also too small here. Its computed value is 13px, vs 14px elsewhere.

[beaulebens]

• Same spacing and font size issues can be seen on Traffic > Site verification:

[beaulebens]

• Also Writing > Custom Content Types:

[eliorivero]

First two fixed in #6377
Last one in #6389