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

doc_src/cmds/popd.rst

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+.. _cmd-popd:
+
+popd - move through directory stack
+===================================
+
+Synopsis
+--------
+
+::
+
+    popd
+
+
+Description
+-----------
+
+``popd`` removes the top directory from the directory stack and changes the working directory to the new top directory. Use :ref:`pushd <cmd-pushd>` to add directories to the stack or :ref:`dirs <cmd-dirs>` to print it.
+
+You may be interested in the :ref:`cdh <cmd-cdh>` command which provides a more intuitive way to navigate to recently visited directories.
+
+Example
+-------
+
+::
+
+    pushd /usr/src
+    # Working directory is now /usr/src
+    # Directory stack contains /usr/src
+
+    pushd /usr/src/fish-shell
+    # Working directory is now /usr/src/fish-shell
+    # Directory stack contains /usr/src /usr/src/fish-shell
+
+    popd
+    # Working directory is now /usr/src
+    # Directory stack contains /usr/src
+