docs: atomic_bitops.txt: add a title for this document

This document misses a title. Add it, in order to follow the documentation standard. Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Jonathan Corbet <[email protected]>
ambv · Apr 11, 2019 · 4961836 · 4961836
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-On atomic bitops.
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+=============
+Atomic bitops
+=============
 
 While our bitmap_{}() functions are non-atomic, we have a number of operations
 operating on single bits in a bitmap that are atomic.