Remove code in PDF; link to PR should suffice.

Author: mlfbrown

docs/assignments/hw4-25.md

@@ -26,7 +26,7 @@ We will be using the [Jest](https://jestjs.io) unit testing framework for Javasc
 
 Follow [these instructions](https://jestjs.io/docs/getting-started) to install the Jest framework in your calculator front end and backend applications. We have already created a test directory in calculator-backend to store your new test cases. The tests in the frontend code are in the src/ subdirectory of calculator-frontend. 
 
-Let's fix one configuration error in the calculator code. 
+Let's fix one configuration error in the calculator code; this is necessary because of a bug in Jest/Axios interactions. 
 
 Edit calculator-frontend/package.json. Change the line starting with "test" inside of the "scripts" object to read:
 
@@ -38,7 +38,7 @@ Edit calculator-frontend/package.json. Change the line starting with "test" insi
 
 ### 2. Run our test cases
 
-Jest runs all files whose name ends in .test.js. 
+Jest runs all files whose names end in .test.js. 
 In calculator-backend/tests, there's a file called calculate.test.js. The code currently in there tests the calculate function by evaluating 2+3 and making sure the function returns 5. 
 
 Run the test by executing:
@@ -149,7 +149,7 @@ ensure that no two members test the same feature.
   
 #### Turn in instructions
 
-Copy your test code into the PDF that you turn in. Also take a screenshot that shows your new test cases passing and put this in the PDF as well.
+Take a screenshot that shows your new test cases passing and put this in your PDF.
 
 ### 6. Check in your test code.