Remove :Git --paginate from docs

I thought the --paginate option was basically the opposite of
--no-pager, but it actually forces the entire command to run through a
pager, breaking a lot of interactive commands.  Let's de-emphasize it as
a solution.

doc/fugitive.txt

@@ -31,9 +31,6 @@ that are part of Git repositories).
 :Git -P {args}          |:edit| the temp file instead.  A temp file is always
                         used for diff and log commands.
 
-:Git --paginate {args}  Like |:Git|, but use |:terminal| if it is available.
-:Git -p {args}
-
                                                 *fugitive-:Gcd*
 :Gcd [directory]        |:cd| relative to the repository.