polishing the text

Author: hajgato

mkdocs/docs/HPC/r-packages.md

@@ -37,8 +37,9 @@ in `R`. This command will show the package locations, ordered by their prioritie
 
 ### Missing R packages intalled before
 
-Please be aware that if you have installed an `R` packages yourself in the past (before end of February 2025),
-you might have to reinstall those if you want to use them:
+Please be aware that if you have installed `R` packages yourself before February 2025,
+then you have to reinstall all of them. You might have to reinatsll self
+installed `R` packages if you want to use them:
 
 - on a different cluster
 - with a different version of `R`