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

doc_src/cmds/nextd.rst

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+.. _cmd-nextd:
+
+nextd - move forward through directory history
+==============================================
+
+Synopsis
+--------
+
+::
+
+    nextd [ -l | --list ] [POS]
+
+
+Description
+-----------
+
+``nextd`` moves forwards ``POS`` positions in the history of visited directories; if the end of the history has been hit, a warning is printed.
+
+If the ``-l`` or ``--list`` flag is specified, the current directory history is also displayed.
+
+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 which this command manipulates.
+
+You may be interested in the :ref:`cdh <cmd-cdh>` command which provides a more intuitive way to navigate to recently visited directories.
+
+Example
+-------
+
+
+
+::
+
+    cd /usr/src
+    # Working directory is now /usr/src
+
+    cd /usr/src/fish-shell
+    # Working directory is now /usr/src/fish-shell
+
+    prevd
+    # Working directory is now /usr/src
+
+    nextd
+    # Working directory is now /usr/src/fish-shell
+