bors fd62c180fe Auto merge of #6162 - josephlr:empty-loop-no-std, r=flip1995
Update empty_loop documentation/message.

Originally part of #6161, but now this PR only deals with `std` crates

This change:
  - Updates the `std` message .
  - Updates the docs to mention how the busy loops should be fixed
    - Gives examples of how to do this for `no_std` targets
  - Updates the tests/stderr files to test this change.

changelog: Update `empty_loop` lint documentation
2020-10-25 09:56:16 +00:00
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