Rollup merge of #46218 - rust-lang:frewsxcv-rename-slice-swap-param, r=kennytm
Rollup merge of #46218 - rust-lang:frewsxcv-rename-slice-swap-param, r=kennytm

Rename param in `[T]::swap_with_slice` from `src` to `other`.

The idea of ‘source’ and ‘destination’ aren’t very applicable for this
operation since both slices can both be considered sources and
destinations.

aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust