More consistently use spaces after commas in lists in docs #79275
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This PR changes instances of lists that didn't use spaces after commas, like
vec![1,2,3]
, tovec![1, 2, 3]
to be more consistent with idiomatic Rust style (the way these were looks strange to me, especially because there are often lists that do use spaces after the commas later in the same code block 😬).I noticed one of these in an example in the stdlib docs and went looking for more, but as far as I can see, I'm only changing those spots in user-facing documentation or rustc output, and the changes make no semantic difference.