message: Fix linewidth, whitespaces etc in vim.
  Original change was in the github markdown editor which is handy in
  previewing the file, but makes formatting annoying.
diff: @@ -72,7 +72,11 @@ We strongly recommend that contributors:
  * We will be adding internal checks that automate this requirement by
  matching the PR description to the regexp: `(Fixes|Issue) #`
  -1. Unit tests are critical to a healthy codebase. PRs without tests should be the exception rather than the norm. And contributions to improve, simplify, or make the unit tests more exhaustive are welcome! Please refer to [this guideline](https://google.github.io/eng-practices/review/developer/small-cls.html#test_code) on how test code and writing small PRs should be reconciled.
  +1. Unit tests are critical to a healthy codebase. PRs without tests should be
  + the exception rather than the norm. And contributions to improve, simplify,
  + or make the unit tests more exhaustive are welcome! Please refer to
  + [this guideline](https://google.github.io/eng-practices/review/developer/small-cls.html#test_code)
  + on how test code and writing small PRs should be reconciled.
  ## Guidlines for Specific Contribution Categories
  @@ -88,7 +92,9 @@ fixing a bug needs a bigger architectural change.
  [TF Lite Micro Github issue](https://github.com/tensorflow/tensorflow/issues/new?labels=comp%3Amicro&template=70-tflite-micro-issue.md)
  to determine the scope of the bug fix.
  1. Send a PR (if that is determined to be the best path forward).
  -1. Bugfix PRs should be accompanied by a test case that fails prior to the fix and passes with the fix to both validate that the fix works as expected and prevent future regressions.
  +1. Bugfix PRs should be accompanied by a test case that fails prior to the fix
  + and passes with the fix. This validates that the fix works as expected, and
  + helps prevent future regressions.
  ### Reference Kernel Implementations
  @@ -159,4 +165,3 @@ and more scalable.
  Having said that, we still invite feature requests via
  [TF Lite Micro Github issues](https://github.com/tensorflow/tensorflow/issues/new?labels=comp%3Amicro&template=70-tflite-micro-issue.md)
  to determine if the requested feature aligns with the TFLM roadmap.
  -
  