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These were found by the "codespell" tool.

This fixes a simple spelling mistake.

Changing the name of an optional parameter is potentially dicey, but
in python3, int.to_bytes calls this parameter "byteorder" so i doubt
that anyone is using the misspelled "endianess" anywhere outside of
pykeymgr anyway.

info documents generally like to have a category and a directory entry
available for system-wide indexing.  I can't find anyone who uses a
category other than Miscellaneous for the category, sadly, but
apparently info will be happier with a dummy category like
Miscellaneous than with no category at all.

Still there are some problems with clang on 32-bit systems, so the atomic
functionality is no longer required for such systems (statistics or mod-cookies
might work slightly wrong).