mdbx: a lot of spelling (squashed).

Many Thanks to Josh Soref for these fixes.
https://github.com/jsoref

Resolves https://github.com/erthink/libmdbx/pull/118.

Change-Id: I4e09347da5c9d7a77cdd918a3b15284371440076

test/chrono.h

@@ -94,6 +94,6 @@ inline time from_timeval(const struct timeval &tv) {
 #endif /* HAVE_TIMEVAL_TV_USEC */
 
 time now_realtime();
-time now_motonic();
+time now_monotonic();
 
 } /* namespace chrono */