doc: git-diff: apply format changes to diff-generate-patch

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/diff-generate-patch.txt

@@ -14,7 +14,7 @@ You can customize the creation of patch text via the
 `GIT_EXTERNAL_DIFF` and the `GIT_DIFF_OPTS` environment variables
 (see linkgit:git[1]), and the `diff` attribute (see linkgit:gitattributes[5]).
 
-What the -p option produces is slightly different from the traditional
+What the `-p` option produces is slightly different from the traditional
 diff format:
 
 1.   It is preceded by a "git diff" header that looks like this:
@@ -30,20 +30,21 @@ name of the source file of the rename/copy and the name of
 the file that the rename/copy produces, respectively.
 
 2.   It is followed by one or more extended header lines:
-
-       old mode <mode>
-       new mode <mode>
-       deleted file mode <mode>
-       new file mode <mode>
-       copy from <path>
-       copy to <path>
-       rename from <path>
-       rename to <path>
-       similarity index <number>
-       dissimilarity index <number>
-       index <hash>..<hash> <mode>
 +
-File modes are printed as 6-digit octal numbers including the file type
+[synopsis]
+old mode <mode>
+new mode <mode>
+deleted file mode <mode>
+new file mode <mode>
+copy from <path>
+copy to <path>
+rename from <path>
+rename to <path>
+similarity index <number>
+dissimilarity index <number>
+index <hash>..<hash> <mode>
++
+File modes _<mode>_ are printed as 6-digit octal numbers including the file type
 and file permission bits.
 +
 Path names in extended headers do not include the `a/` and `b/` prefixes.
@@ -56,7 +57,7 @@ files, while 100% dissimilarity means that no line from the old
 file made it into the new one.
 +
 The index line includes the blob object names before and after the change.
-The <mode> is included if the file mode does not change; otherwise,
+The _<mode>_ is included if the file mode does not change; otherwise,
 separate lines indicate the old and the new mode.
 
 3.  Pathnames with "unusual" characters are quoted as explained for
@@ -134,17 +135,18 @@ or like this (when the `--cc` option is used):
 
 2.   It is followed by one or more extended header lines
      (this example shows a merge with two parents):
-
-       index <hash>,<hash>..<hash>
-       mode <mode>,<mode>..<mode>
-       new file mode <mode>
-       deleted file mode <mode>,<mode>
++
+[synopsis]
+index <hash>,<hash>..<hash>
+mode <mode>,<mode>`..`<mode>
+new file mode <mode>
+deleted file mode <mode>,<mode>
 +
 The `mode <mode>,<mode>..<mode>` line appears only if at least one of
 the <mode> is different from the rest. Extended headers with
 information about detected content movement (renames and
 copying detection) are designed to work with the diff of two
-<tree-ish> and are not used by combined diff format.
+_<tree-ish>_ and are not used by combined diff format.
 
 3.   It is followed by a two-line from-file/to-file header: