fix setting parsing error and org help reference

lisp/my/my-org-article.org

@@ -457,7 +457,7 @@ print(fname, end='')
 
 **** using my-tex.mplstyle
 #+HEADER: :prologue (mpl-prologue "my-tex")
-#+HEADER: :var fname=(mpl-var "img-matplotlib-tex")
+#+HEADER: :var fname=(mpl-var "img/figure-matplotlib-tex")
 #+begin_src python :results output file
 import math as m
 import matplotlib as mpl
@@ -484,7 +484,7 @@ print(fname, end='')
 
 #+ATTR_ORG: :width 500
 #+RESULTS:
-[[file:img-matplotlib-tex.svg]]
+[[file:img/figure-matplotlib-tex.svg]]
 
 ** Example / Verbatim
 #+BEGIN_EXAMPLE

settings/org-settings.el

@@ -926,7 +926,7 @@ except:
 "
                            (concat config-dir "scripts/fonts")
                            (concat config-dir "scripts/matplotlib-stylelib")
-                           (or mplstyle "my")))))
+                           (or mplstyle "my"))))))
 
 (use-package ol-notmuch
   :after (org))