revert to link to section

homework/hw04.md

@@ -9,7 +9,8 @@ $\lambda$-expression that your evaluator can evaluate.
 Your solution should follow Lecture 11, where I show how to create a 
 type constructor `Parser` 
 and make it into an instance of `Monad`.
-Create a module [`Parser.hs`](https://github.com/aicenter/FUP/blob/main/lectures/Parser.hs) that you import into your solution.
+Create a module `Parser.hs` containing the code from [Parser module section](#parser-module)
+that you import into your solution.
 
 The parser should be implemented as a Haskell module called `Hw4`. 
 Note the capital `H`. The
@@ -29,7 +30,7 @@ import Hw3
 ```
 
 There are four imports. The first two necessary libraries so that the definitions from 
-Lecture 11 work. The third is the module `Parser` whose code is [here](https://github.com/aicenter/FUP/blob/main/lectures/Parser.hs). 
+Lecture 11 work. The third is the module `Parser` whose code is [here](#parser-module). 
 The last import is your previous homework assignment. So be sure that you have
 your `Hw3.hs`
 and `Parser.hs`