babel: Provide missing docstrings

	* ob-sh.el (org-babel-sh-variable-assignments):
	Provide missing docstring
	* ob-python.el (org-babel-python-variable-assignments):
	Provide missing docstring

lisp/ob-python.el

@@ -101,6 +101,7 @@ This function is called by `org-babel-execute-src-block'."
 ;; helper functions
 
 (defun org-babel-python-variable-assignments (params &optional processed-params)
+  "Return list of python statements assigning the block's variables"
   (mapcar
    (lambda (pair)
      (format "%s=%s"

lisp/ob-sh.el

@@ -90,6 +90,7 @@ This function is called by `org-babel-execute-src-block'."
 ;; helper functions
 
 (defun org-babel-sh-variable-assignments (params &optional processed-params)
+  "Return list of shell statements assigning the block's variables"
   (let ((sep (cdr (assoc :separator params))))
     (mapcar
      (lambda (pair)