Clarify comment

Remove an ambiguous part of the comment that can cause confusion -
passing a WaitGroup by pointer is always mandatory.

examples/waitgroups/waitgroups.go

@@ -23,8 +23,6 @@ func main() {
 	// This WaitGroup is used to wait for all the
 	// goroutines launched here to finish. Note: if a WaitGroup is
 	// explicitly passed into functions, it should be done *by pointer*.
-	// This would be important if, for example, our worker had to launch
-	// additional goroutines.
 	var wg sync.WaitGroup
 
 	// Launch several goroutines and increment the WaitGroup

examples/waitgroups/waitgroups.hash

@@ -1,2 +1,2 @@
-58031ceb701a1cab27498efd89adadbf1ea6b3e6
-vmjCBfN6MJE
+66d1c1cdb7e60f63b9b30938aa9c63b2262463ac
+S98GjeaGBX0