patchdoc/diff-options: fix link to generating patch section

> Next, when formatted as man-page, the section title is rendered
> "GENERATING PATCH TEXT WITH -P" whereas reference still reads
> "Generating patch text with -p", that is both inconsistent and makes
> searching harder than it needs to be.
>
> Fix the issues by just referring to the section, without custom
> reference text, and then unconditionally.

> Fixes: ebdc46c242 (docs: link generating patch sections)
> Signed-off-by: Sergey Organov <sorganov@gmail.com>
> ---
>  Documentation/diff-options.txt | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
> index 9f33f887711d..c07488b123c6 100644
> --- a/Documentation/diff-options.txt
> +++ b/Documentation/diff-options.txt
> @@ -22,13 +22,7 @@ ifndef::git-format-patch[]
>  -p::
>  -u::
>  --patch::
> -	Generate patch (see section titled
> -ifdef::git-log[]
> -<<generate_patch_text_with_p, "Generating patch text with -p">>).
> -endif::git-log[]
> -ifndef::git-log[]
> -"Generating patch text with -p").
> -endif::git-log[]
> +	Generate patch (see <<generate_patch_text_with_p>>).
>  ifdef::git-diff[]
>  	This is the default.
>  endif::git-diff[]

> Sergey Organov <sorganov@gmail.com> writes:
>
>> First, there is no need for conditional referencing, as all the files
>> that include "diff-options.txt" eventually include
>> "diff-generate-patch.txt" as well.
>
> Except for git-format-patch.txt which includes the former but not
> the latter.  But this is inside ifndef::git-format-patch[], so the
> above description being a bit imprecise does not cause any actual
> damage.

>
>     Documentation for all commands that want to describe the `-p`
>     option by including the "diff-options.txt" file also include the
>     "diff-generate-patch.txt" file, so an internal link would work
>     for all of them.

> Sergey Organov <sorganov@gmail.com> writes:
>
>> First, there is no need for conditional referencing, as all the files
>> that include "diff-options.txt" eventually include
>> "diff-generate-patch.txt" as well.
>
> Except for git-format-patch.txt which includes the former but not
> the latter.  But this is inside ifndef::git-format-patch[], so the
> above description being a bit imprecise does not cause any actual
> damage.
>
>     Documentation for all commands that want to describe the `-p`
>     option by including the "diff-options.txt" file also include the
>     "diff-generate-patch.txt" file, so an internal link would work
>     for all of them.
>
> or something like that, perhaps.