Update part9b.md

the URL localhost:3002 was probably supposed to be localhost:3003 since that is what is used earlier in the course materials?

Author: Robomarti

src/content/9/en/part9b.md

@@ -804,7 +804,7 @@ Make sure there aren't any errors!
 
 #### 9.5 WebBMI
 
-Add an endpoint for the BMI calculator that can be used by doing an HTTP GET request to the endpoint *bmi* and specifying the input with [query string parameters](https://en.wikipedia.org/wiki/Query_string). For example, to get the BMI of a person with a height of 180 and a weight of 72, the URL is <http://localhost:3002/bmi?height=180&weight=72>.
+Add an endpoint for the BMI calculator that can be used by doing an HTTP GET request to the endpoint *bmi* and specifying the input with [query string parameters](https://en.wikipedia.org/wiki/Query_string). For example, to get the BMI of a person with a height of 180 and a weight of 72, the URL is <http://localhost:3003/bmi?height=180&weight=72>.
 
 The response is a JSON of the form: