Fix docs: BufReader/File doesn't need to be mut #43366
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Fix docs: BufReader/File doesn't need to be mut Neither `BufReader` nor `File` need to be declared `mut` for most of these examples. The cookbook example using `BufReader` doesn't declare them as `mut` either (https://brson.github.io/rust-cookbook/basics.html#ex-std-read-lines).
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Neither
BufReadernorFileneed to be declaredmutfor most of these examples. The cookbook example usingBufReaderdoesn't declare them asmuteither (https://brson.github.io/rust-cookbook/basics.html#ex-std-read-lines).