GRWLock: Tweak doc to make things a bit clearer
Close issue #832 (closed)
The doc used different phrasing for the same thing, e.g. "if any thread" vs "any other thread."
Also make it clear that trying to take a write lock while already having a lock, or trying to take a read lock while having a write lock, is undefined.
Fixes: #832 (closed)
Edited by Philip Withnall