Made text shorter (#6739)

src/data/roadmaps/golang/content/100-go-basics/108-functions.md

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 # Functions
 
-Discover how functions work in Go, the list of resources below will cover :
+Discover how functions work in Go, the list of resources below will cover:
 
 - How to define and call functions in Go?
 - Named returns in Go?
 - Handle multiple return types.
-- Different types of functions in Go.
+- Different function types in Go.
 
 Visit the following resources to learn more: