[media] docs-next: stop abusing on the cpp domain

Now that we have an override for the c domain that will do
the right thing for the Kernel, stop abusing on the cpp
domain.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/func-write.rst

@@ -20,7 +20,7 @@ Synopsis
     #include <unistd.h>
 
 
-.. cpp:function:: ssize_t write( int fd, void *buf, size_t count )
+.. c:function:: ssize_t write( int fd, void *buf, size_t count )
 
 
 Arguments