fix crosslinks format adding a blank line after (#6789)

courses/free-courses-en.md

@@ -982,6 +982,7 @@
 #### Angular
 
 > :information_source: See also … [AngularJS](#angularjs)
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 * [Angular 12 Course](https://www.youtube.com/playlist?list=PLjsBk8SIQEi-RqkglLcn19TaeeopcuDXV) - Slobodan Gajic
 * [Angular 6 Tutorials](https://www.youtube.com/playlist?list=PLYxzS__5yYQlqCmHqDyW3yo5V79C7eaTe) - codedamn (YouTube)
 * [Angular Courses](https://www.youtube.com/playlist?list=PLTjRvDozrdlxAhsPP4ZYtt3G8KbJ449oT) - Programming with Mosh (YouTube)