Add start param in Aho traverse_word

Author: Joseph-Edwards

src/aho-corasick.cpp

@@ -371,7 +371,7 @@ index *start*, and traversing using the letters in the word *w*.
 :param ac: object to traverse.
 :type ac: AhoCorasick
 
-:param start: TODO(0)
+:param start: the index of the node to first traverse from.
 :type start: int
 
 :param w: Word to traverse by

src/knuth-bendix.cpp

@@ -318,7 +318,6 @@ instance.
           .def(py::init<congruence_kind, Presentation<std::string> const&>(),
                py::arg("knd"),
                py::arg("p"),
-               // TODO(0) this constructor's doc is duplicated, but including
                R"pbdoc(
 :sig=(knd: congruence_kind, p: PresentationStrings) -> None:
 :only-document-once: