Adjust wording, drop colon in Proven use cases subtitle

Co-authored-by: Jamie Thompson <bishbashboshjt@gmail.com>
Co-authored-by: Naftoli Gugenheim <98384+nafg@users.noreply.github.com>

Author: bishabosha

index.md

@@ -70,7 +70,7 @@ whyScalaTitle: "Why Scala?"
 
 # Scala use cases
 useCaseTitle: "Proven Use Cases"
-useCaseIntroduction: "People around the world trust Scala to build useful software. Some of the most popular domains include:"
+useCaseIntroduction: "People around the world trust Scala to build useful software. Popular domains include"
 
 # Scala ecosystem
 ecosystemTitle: "Scala's libraries unlock your potential"