Move docs folder to man.

docs/src/git-mark-merge-base.txt

Index: docs/src/git-mark-merge-base.txt
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-git-mark-merge-base(1)
-======================
-
-NAME
-----
-git-mark-merge-base -
-include::_git-mark-merge-base_desc.helper.txt[]
-
-SYNOPSIS
---------
-[verse]
-'git mark-merge-base'
-'git mark-merge-base' <commit hash>
-'git mark-merge-base' [-d | --delete]
-
-DESCRIPTION
------------
-
-Inspect, set or delete the current merge-base marker for the current branch.
-This should not be needed, but is useful if things get into a snarled state.
-Pass no arguments to view the current value. If you provide <commit hash>, then
-`git mark-merge-base` will attempt to set that as the merge-base value.
-
-It is invalid to pick a commit which is not an ancestor of the current branch.
-
-See linkgit:git-rebase-update[1]'s description of the `branch.<name>.base`
-configuration variable for more info on what the merge base markers are for.
-
-OPTIONS
--------
-
--d::
---delete::
-  Delete the merge-base marker for the current branch.
-
-<commit hash>::
-  The new value to set for the current branch's merge-base marker.
-
-SEE ALSO
---------
-linkgit:git-rebase-update[1], linkgit:git-reparent-branch[1],
-linkgit:git-rename-branch[1], linkgit:git-upstream-diff[1]
-
-include::_footer.txt[]
-
-// vim: ft=asciidoc: