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

doc_src/cmds/fish_right_prompt.rst

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+.. _cmd-fish_right_prompt:
+
+fish_right_prompt - define the appearance of the right-side command line prompt
+===============================================================================
+
+Synopsis
+--------
+
+::
+
+  function fish_right_prompt
+      ...
+  end
+
+
+Description
+-----------
+
+``fish_right_prompt`` is similar to ``fish_prompt``, except that it appears on the right side of the terminal window.
+
+Multiple lines are not supported in ``fish_right_prompt``.
+
+
+Example
+-------
+
+A simple right prompt:
+
+
+
+::
+
+    function fish_right_prompt -d "Write out the right prompt"
+        date '+%m/%d/%y'
+    end
+
+