Inconsistent terminology for -j/--jobs option in documentation

While reading the pg_dump and pg_restore documentation, I noticed
that the terminology for the -j/--jobs option is inconsistent.

## pg_dump [1]
-j njobs
--jobs=njobs

## pg_restore [2]
-j number-of-jobs
--jobs=number-of-jobs

For the sake of consistency, I think it would be better to revise the 
terminology as follows:

    s/number-of-jobs/njobs/