Updates to Token.h's documentation.

src/Token.h

@@ -50,6 +50,7 @@ enum TokenType
 
 extern const std::string token_strings[];
 
+/* Struct to represent tokens generated by the Lexer. */
 struct Token
 {
     TokenType tk_type;
@@ -101,4 +102,5 @@ private:
     std::string line_text;
 };
 
+/* typedef to make it easier to see a what a std::vector of tokens is being used for. */
 typedef std::vector<Token> TokenStream;