GIT_SILENT Fix comments on kf5-qt5-build-include

kdesrc-build will process dependencies for kde-projects modules no
matter how they are referenced, as long as they are part of a module-set
using the 'magic' kde-projects repository.

Also the referenced kf5-extragear-build-include file only seems to pull
in a few modules, certainly not much of extragear and playground.

kf5-qt5-build-include

@@ -15,12 +15,12 @@ include kf5-workspace-build-include
 include kf5-applications-build-include
 include kf5-kdepim-build-include
 
-# Here's how to add extragear and playground (at least those modules that have a kf5-qt5 branch group)
+# Uncomment the following to include some specific extragear modules (you can edit the file to
+# choose your own)
 #include kf5-extragear-build-include
 
-# or without dependency order:
+# or simply pull in all possible extragear and playground modules.
 #module-set
     #repository kde-projects
     #use-modules extragear playground
 #end module-set
-