docs: fix link to instrumentation library (#21)

* fix(docs): link to instrumentation library

* fix: use shorter link to repo

Co-authored-by: Adrien Brault <[email protected]>

---------

Co-authored-by: Adrien Brault <[email protected]>

Author: nesl247

README.md

@@ -107,7 +107,7 @@ Add the following to your `phpunit.xml` configuration:
 
 <img width="1242" alt="Screen Shot 2021-05-18 at 18 02 22" src="https://user-images.githubusercontent.com/611271/118685271-3f385080-b803-11eb-95f0-7d68c0e96857.png">
 
-This feature requires [sourceability/instrumentation][hyperlink_terminals] with the following bundle configuration:
+This feature requires [sourceability/instrumentation][sourceability_instrumentation] with the following bundle configuration:
 
 ```yaml
 sourceability_instrumentation: