docs: Fix empty parallelism argument

When there was no parallelism (no top-level -j arg and a pre-1.7
sphinx-build), the argument passed would be empty ("") instead of just
being missing, which would (understandably) badly confuse sphinx-build.
Fix this by removing the quotes.

Reported-by: Rafael J. Wysocki <[email protected]>
Fixes: 51e46c7 ("docs, parallelism: Rearrange how jobserver reservations are made")
Cc: [email protected]  # v5.5 only
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

Author: kees

Documentation/sphinx/parallel-wrapper.sh

@@ -30,4 +30,4 @@ if [ -n "$parallel" ] ; then
 	parallel="-j$parallel"
 fi
 
-exec "$sphinx" "$parallel" "$@"
+exec "$sphinx" $parallel "$@"