This is a follow-up to #29322, specifically "allowing easy placement of
the `.form-check-input` in more places." In my testing in Firefox and
Chrome, setting `vertical-align: top` removes the need to add
`float-left` to vertically align the checkbox and label text. And doing
so does not visually affect examples which do apply `float: left` via
nesting in a `.form-check`.
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