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

doc_src/cmds/prompt_pwd.rst

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+.. _cmd-prompt_pwd:
+
+prompt_pwd - Print pwd suitable for prompt
+==========================================
+
+Synopsis
+--------
+
+::
+
+    function fish_prompt
+        echo -n (prompt_pwd) '$ '
+    end
+
+Description
+-----------
+
+``prompt_pwd`` is a function to print the current working directory in a way suitable for prompts. It will replace the home directory with "~" and shorten every path component but the last to a default of one character.
+
+To change the number of characters per path component, set ``$fish_prompt_pwd_dir_length`` to the number of characters. Setting it to 0 or an invalid value will disable shortening entirely.
+
+Examples
+--------
+
+::
+
+    >_ cd ~/
+    >_ echo $PWD
+    /home/alfa
+
+    >_ prompt_pwd
+    ~
+
+    >_ cd /tmp/banana/sausage/with/mustard
+    >_ prompt_pwd
+    /t/b/s/w/mustard
+
+    >_ set -g fish_prompt_pwd_dir_length 3
+    >_ prompt_pwd
+    /tmp/ban/sau/wit/mustard