Fix up links and misc typo

Author: luke-hill

python/cucumber_tag_expressions/parser.py

@@ -223,7 +223,7 @@ def make_operand(cls, text):
         Returns:
             Literal: Operand object created from text.
         """
-        # -- EXTENSION-POINT: For cucumber/common#406 or similar.
+        # -- EXTENSION-POINT: #TODO: See https://github.com/cucumber/common/issues/406 for a similar extension point.
         return Literal(text)
 
     @classmethod

python/tests/unit/test_parser.py

@@ -230,7 +230,7 @@ def test_parse__fails_for_empty_parens_groups(self, text, error_message):
         ("a and (b c) or", "Syntax error. Expected operator after b"),
     ])
     def test_parse__fails_with_rpn_notation(self, text, expected):
-        # -- NOTE: RPN parsebility due to Shunting-yard algorithm (stack-based).
+        # -- NOTE: RPN parseability due to Shunting-yard algorithm (stack-based).
         self.assert_parse_with_error_contains_message(text, expected)
 
     # -- TODO: