Update doc.zih.tu-dresden.de/docs/contrib/howto_contribute.md

doc.zih.tu-dresden.de/docs/contrib/howto_contribute.md

@@ -14,12 +14,12 @@ Moreover, is is constantly reviewed and updated.
 ## Technical Setup
 
 This documentation is written in markdown and translated into static html pages using
-[mkdocs](https://www.mkdocs.org/). The single configuration file `mkdocs.yml` holds the pages
-structure as well as specification of the theme and extensions.
+[mkdocs](https://www.mkdocs.org/). The single configuration file `mkdocs.yml` contains the page
+structure as well as the specification of the theme and extensions.
 
 We manage all essential files (markdown pages, graphics, configuration, theme, etc.) within a
 [public Git repository](https://gitlab.hrz.tu-chemnitz.de/zih/hpcsupport/hpc-compendium),
-allowing for collaborative working and revision control. GitLab features offer different
+allowing for collaborative working and revision control. GitLab's features offer different
 possibilities of contribution and ensure up-to-date and consistent content by including a review
 process. In principle, there are three possible ways how you can contribute to this documentation.
 These are outlined below.