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

doc_src/cmds/dirh.rst

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+.. _cmd-dirh:
+
+dirh - print directory history
+==============================
+
+Synopsis
+--------
+
+::
+
+    dirh
+
+Description
+-----------
+
+``dirh`` prints the current directory history. The current position in the history is highlighted using the color defined in the ``fish_color_history_current`` environment variable.
+
+``dirh`` does not accept any parameters.
+
+Note that the ``cd`` command limits directory history to the 25 most recently visited directories. The history is stored in the ``$dirprev`` and ``$dirnext`` variables.