git: add comments for patches

Adds inline comments for all patches as per CONTRIBUTING.md

pkgs/applications/version-management/git/default.nix

@@ -100,11 +100,19 @@ stdenv.mkDerivation (finalAttrs: {
   enableParallelInstalling = true;
 
   patches = [
+    # This patch does two things: (1) use the right name for `docbook2texi',
+    # and (2) make sure `gitman.info' isn't produced since it's broken
+    # (duplicate node names).
     ./docbook2texi.patch
+    # Fix references to gettext.sh at runtime: hard-code it to
+    # ${pkgs.gettext}/bin/gettext.sh instead of assuming gettext.sh is in $PATH
     ./git-sh-i18n.patch
+    # Do not search for sendmail in /usr, only in $PATH
     ./git-send-email-honor-PATH.patch
   ]
   ++ lib.optionals withSsh [
+    # Hard-code the ssh executable to ${pkgs.openssh}/bin/ssh instead of
+    # searching in $PATH
     ./ssh-path.patch
   ];