* Documentation/guides/cortexmhardfaults.rst:
New. Migrated from [1] with conversion to reStructuredText,
minor typo fixes, and a link to a Narkive archive of the
original quoted question.
* Documentation/guides/index.rst:
Add above to TOC.
[1] https://cwiki.apache.org/confluence/display/NUTTX/Analyzing+Cortex-M+Hardfaults
