Updated documentation on patch releases (#2007)

* Updated documentation on patch releases

* Remove unused xref

* Improve language and fix capitalization

---------

Co-authored-by: NikolaiFa <NikolaiFa@beckhoff.com>
Co-authored-by: Torsten Sommer <torsten.sommer@3ds.com>

docs/1___overview.adoc

@@ -56,9 +56,9 @@ Parallel to the new standard features, the FMI Design Community has improved the
 * integrating within the FMI Standard only validated C-code, XML and XSD snippets to reduce redundancy and ensure correctness.
 
 
-==== Changes in FMI 3.0.1 [[fmi-301]]
+==== Changes in FMI 3.0.x
 
-Clarifications and fixes in FMI 3.0.1 are listed in the https://github.com/modelica/fmi-standard/releases[Release notes on Github.]
+Clarifications and fixes of all FMI 3.0 patch releases (FMI 3.0.x) are listed in the https://github.com/modelica/fmi-standard/releases[release notes on GitHub].
 
 === Overview