rustc --emit=foo=file is not documented in rustc --help -v #139805
Description
Similar to #139794, emitting to a file is not explained in --help. This is a little more complex to concisely explain than --print, since the different emit kinds interact differently with an output path.
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Area: Command-line interface (CLI) to the compilerArea: Messages for errors, warnings, and lintsCategory: An issue proposing an enhancement or a PR with one.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Relevant to the compiler team, which will review and decide on the PR/issue.