Support list of wordlists as a string

Allow a wordlist filename string to contain a list of wordlist filenames

sphinxcontrib/spelling/builder.py

@@ -106,6 +106,13 @@ def get_wordlist_filename(self):
         if word_list is None:
             word_list = 'spelling_wordlist.txt'
 
+        if (isinstance(word_list, str) and 
+            word_list.startswith('[') and 
+            word_list.endswith(']')):
+            # Wordlist is a list, formatted as a str.
+            # Split it back into a list
+            word_list = word_list[1:-1].split(',')
+
         if not isinstance(word_list, list):
             return os.path.join(self.srcdir, word_list)