Add a manual page for git-cl

The most important git subcommand in depot_tools never had a man
page until today. And now "git help cl" and "git cl --help" will
work.

BUG=695623

Change-Id: Ic0d05fa8d70d2ef6e71d58e0d7d3e7adc4a2fa32
Reviewed-on: https://chromium-review.googlesource.com/447216
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
diff --git a/man/man1/git-upstream-diff.1 b/man/man1/git-upstream-diff.1
index 44621c8..231e696 100644
--- a/man/man1/git-upstream-diff.1
+++ b/man/man1/git-upstream-diff.1
@@ -2,12 +2,12 @@
 .\"     Title: git-upstream-diff
 .\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
 .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
-.\"      Date: 12/15/2016
+.\"      Date: 02/27/2017
 .\"    Manual: Chromium depot_tools Manual
-.\"    Source: depot_tools f72f1ad
+.\"    Source: depot_tools a6ba28f5
 .\"  Language: English
 .\"
-.TH "GIT\-UPSTREAM\-DIFF" "1" "12/15/2016" "depot_tools f72f1ad" "Chromium depot_tools Manual"
+.TH "GIT\-UPSTREAM\-DIFF" "1" "02/27/2017" "depot_tools a6ba28f5" "Chromium depot_tools Manual"
 .\" -----------------------------------------------------------------
 .\" * Define some portability stuff
 .\" -----------------------------------------------------------------