Fix external links to compatibility

Author: fatso83

docs/_releases/v11.md

@@ -36,5 +36,5 @@ If you need to support old runtimes you can try [Sinon 9][compat-doc-v9].
 
 {% include docs/contribute.md %}
 
-[compat-doc]: https://github.com/sinonjs/sinon/COMPATIBILITY.md
+[compat-doc]: https://github.com/sinonjs/sinon/blob/main/COMPATIBILITY.md
 [compat-doc-v9]: https://github.com/sinonjs/sinon/blob/v9.2.4/COMPATIBILITY.md

docs/_releases/v12.md

@@ -36,5 +36,5 @@ If you need to support old runtimes you can try [Sinon 9][compat-doc-v9].
 
 {% include docs/contribute.md %}
 
-[compat-doc]: https://github.com/sinonjs/sinon/COMPATIBILITY.md
+[compat-doc]: https://github.com/sinonjs/sinon/blob/main/COMPATIBILITY.md
 [compat-doc-v9]: https://github.com/sinonjs/sinon/blob/v9.2.4/COMPATIBILITY.md

docs/_releases/v13.md

@@ -36,5 +36,5 @@ If you need to support old runtimes you can try [Sinon 9][compat-doc-v9].
 
 {% include docs/contribute.md %}
 
-[compat-doc]: https://github.com/sinonjs/sinon/COMPATIBILITY.md
+[compat-doc]: https://github.com/sinonjs/sinon/blob/main/COMPATIBILITY.md
 [compat-doc-v9]: https://github.com/sinonjs/sinon/blob/v9.2.4/COMPATIBILITY.md

docs/_releases/v14.md

@@ -36,5 +36,5 @@ If you need to support old runtimes you can try [Sinon 9][compat-doc-v9].
 
 {% include docs/contribute.md %}
 
-[compat-doc]: https://github.com/sinonjs/sinon/COMPATIBILITY.md
+[compat-doc]: https://github.com/sinonjs/sinon/blob/main/COMPATIBILITY.md
 [compat-doc-v9]: https://github.com/sinonjs/sinon/blob/v9.2.4/COMPATIBILITY.md

docs/_releases/v15.md

@@ -36,5 +36,5 @@ If you need to support old runtimes you can try [Sinon 9][compat-doc-v9].
 
 {% include docs/contribute.md %}
 
-[compat-doc]: https://github.com/sinonjs/sinon/COMPATIBILITY.md
+[compat-doc]: https://github.com/sinonjs/sinon/blob/main/COMPATIBILITY.md
 [compat-doc-v9]: https://github.com/sinonjs/sinon/blob/v9.2.4/COMPATIBILITY.md