Add examples for some methods on slices #121343
Merged
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Adds some examples to some methods on slice.
is_empty
didn't have an example for an empty slice, even thoughstr
and the collections all have one, so I added that in.first_mut
andlast_mut
didn't have an example for what happens when the slice is empty, whereasfirst
andlast
do, so I added that too.