doc: Remove extra "in" from document

On line 16 of this file following sentence has a typo.
> * once done, the updated copy is swapped in in a single

Remove unused "in" from document.

Signed-off-by: alireza <alirezaarzehgar82@gmail.com>

diff --git a/doc/developer/rcu.rst b/doc/developer/rcu.rst
index c8248194b7cc12924ad402b8790c04598436b4e3..ac4405121ea8c33e60ec885f8e21c50cab0de798 100644 (file)
--- a/doc/developer/rcu.rst
+++ b/doc/developer/rcu.rst
@@ -13,7 +13,7 @@ operation (and not a set of APIs.)  The core ideas are:
   "invisible" copies.  Other threads, when they access the structure, see an
   older (but consistent) copy.
 
-* once done, the updated copy is swapped in in a single operation so that
+* once done, the updated copy is swapped in a single operation so that
   other threads see either the old or the new data but no inconsistent state
   between.