Move docs folder to man.

docs/src/git-upstream-diff.txt

Index: docs/src/git-upstream-diff.txt
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-git-upstream-diff(1)
-====================
-
-NAME
-----
-git-upstream-diff -
-include::_git-upstream-diff_desc.helper.txt[]
-
-SYNOPSIS
---------
-[verse]
-'git upstream-diff' [--wordwise] [<extra args for git-diff>*]
-
-DESCRIPTION
------------
-
-Shows a diff beween your current branch and it's upstream. This is 'roughly' the
-same as:
-
-----
-git diff --patience -C -C HEAD@{upstream}  <1> <2>
-----
-<1> `-C -C` detects file copies/renames
-<2> `--patience` uses the patience-diff algorithm, which tends to produce nicer
-  diffs in many cases.
-
-The difference is that `HEAD@{upstream}` is actually the tagged merge base of
-your branch (See linkgit:git-rebase-update[1]). This means that if your upstream
-branch was rebased, but you haven't yet rebased the current branch on top of it,
-you'll still see an accurate diff compared to just diffing against
-`@{upstream}`.
-
-The `--wordwise` option also allows `git-diff` to do word-by-word comparison
-in a semi-intelligent way. However, sometimes it can produce surprising results,
-so it is disabled by default.
-
-
-OPTIONS
--------
-
---wordwise::
-  Print a colorized word-wise diff instead of a line-wise diff.
-
-<extra args for git-diff>::
-  Extra arguments are included in the invocation of linkgit:git-diff[1]. These
-  can be anything that `git-diff` normally takes.
-+
---
-`--stat`;;
-  This is particularly useful to show 'which' files have been changed in
-  comparison to the upstream branch.
-`-- <filename patterns>*`;;
-  Restrict the diff to only show the diff for given files compared to the
-  upstream.
---
-
-
-CONFIGURATION VARIABLES
------------------------
-
-depot-tools.upstream-diff.default-args
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-A list-configuration variable. Each instance of this config variable will be
-prepended to all invocations of `git upstream-diff`, as if you had passed them
-on the command line.
-
-include::_aliases.txt[]
-
-----
-[alias]
-  git udiff = upstream-diff
-----
-
-SEE ALSO
---------
-linkgit:git-rebase-update[1]
-
-include::_footer.txt[]
-
-// vim: ft=asciidoc: