Merge branch 'jc/doc-diff-patch.txt'

Doc update.

* jc/doc-diff-patch.txt:
  docs: link generating patch sections

Author: gitster

Documentation/diff-generate-patch.txt

@@ -1,3 +1,4 @@
+[[generate_patch_text_with_p]]
 Generating patch text with -p
 -----------------------------
 

Documentation/diff-options.txt

@@ -22,7 +22,13 @@ ifndef::git-format-patch[]
 -p::
 -u::
 --patch::
-	Generate patch (see section on generating patches).
+	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[]
 ifdef::git-diff[]
 	This is the default.
 endif::git-diff[]