We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/fish_vcs_prompt.rst

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+.. _cmd-fish_vcs_prompt:
+
+fish_vcs_prompt - output version control system information for use in a prompt
+===============================================================================
+
+Synopsis
+--------
+
+::
+
+     function fish_prompt
+          echo -n (pwd)(fish_vcs_prompt) '$ '
+     end
+
+Description
+-----------
+
+The ``fish_vcs_prompt`` function displays information about the current version control system (VCS) repository, if any.
+
+It calls out to VCS-specific functions. The currently supported systems are:
+
+- :ref:`fish_git_prompt <cmd-fish_git_prompt>`
+- :ref:`fish_hg_prompt <cmd-fish_hg_prompt>`
+- :ref:`fish_svn_prompt <cmd-fish_svn_prompt>`
+
+If a VCS isn't installed, the respective function does nothing.
+
+For more information, see the documentation for each of the functions above.
+
+Example
+-------
+
+A simple prompt that displays all known VCS info::
+
+    function fish_prompt
+        ...
+        set -g __fish_git_prompt_showupstream auto
+        printf '%s %s$' $PWD (fish_vcs_prompt)
+    end