Documentation: coda: annotate duplicated words

At first glance it appears that the coda.rst file contains doubled
words "name name" in two places. Turns out it is just confusing
(at least to me), so try to make it clear that the second 'name'
is just the name of a struct field/member.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: coda@cs.cmu.edu
Cc: codalist@coda.cs.cmu.edu
Link: https://lore.kernel.org/r/d7c2d274-de28-193f-5a98-9e3e16c6c9d5@infradead.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>