add initial spelling wordlist

Author: jmckenna

conf.py

@@ -129,7 +129,7 @@ def __getattr__(cls, name):
 nitpicky = True
 
 # set filename used by spelling extension
-spelling_word_list_filename='spelling_wordlist.md'
+spelling_word_list_filename='spelling_wordlist.dict'
 
 # Options for HTML output
 # -----------------------