[FIX] doc: building on Python 3.6.7, 3.7.1, possibly 2.7.???

https://bugs.python.org/issue33899

tokenize.generate_tokens was altered to match the C tokenizer,
previously it would end the tokenization with just an ENDMARKER, in the
titled releases it adds a NEWLINE before the ENDMARKER if none is
present, this broke the parsing of jsdoc type specifications as Python's
tokenizer is used under the cover.

closes odoo/odoo#28056

doc/_extensions/autojsdoc/parser/types.py

@@ -44,6 +44,8 @@ def tokenize(typespec):
             yield (LITERAL, ast.literal_eval(string))
         elif toktype == token.ENDMARKER:
             return
+        elif toktype == token.NEWLINE:
+            pass
         else:
             raise ValueError("Unknown typespec token %s" % token.tok_name[toktype])