Base: Add link to test-common.js in test-js(1) man page

This is an easy way to view this file as the link will open it in Text
Editor :^)

Base/usr/share/man/man1/test-js.md

@@ -12,7 +12,7 @@ $ test-js [options...]
 
 `test-js` runs the LibJS test suite located in `/home/anon/js-tests`. These
 tests are using a custom JavaScript testing framework inspired by
-[Jest](https://jestjs.io) (see `test-common.js` in the same directory).
+[Jest](https://jestjs.io) (see [`test-common.js`](/home/anon/js-tests/test-common.js)).
 
 ## Options