docs: netdev: Fix typo in Signed-off-by tag

s/of/off/

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Fixes: e110ba6 ("docs: netdev: add note about Changes Requested and revising commit messages")
Link: https://lore.kernel.org/r/20240527103618.265801-2-thorsten.blum@toblux.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: toblux

Documentation/process/maintainer-netdev.rst

@@ -227,7 +227,7 @@ preferably including links to previous postings, for example::
   The amount of mooing will depend on packet rate so should match
   the diurnal cycle quite well.
 
-  Signed-of-by: Joe Defarmer <joe@barn.org>
+  Signed-off-by: Joe Defarmer <joe@barn.org>
   ---
   v3:
     - add a note about time-of-day mooing fluctuation to the commit message