update doc.go, some v5 specific notes were left.

Author: joeybloggs

doc.go

@@ -121,11 +121,6 @@ Here is a list of the current built in validators:
 		gt=0 will be applied to []
 		[]string will be spared validation
 		required will be applied to string
-		NOTE: in Example2 if the required validation failed, but all others passed
-		the hierarchy of FieldError's in the middle with have their IsPlaceHolder field
-		set to true. If a FieldError has IsSliceOrMap=true or IsMap=true then the
-		FieldError is a Slice or Map field and if IsPlaceHolder=true then contains errors
-		within its SliceOrArrayErrs or MapErrs fields.
 
 	required
 		This validates that the value is not the data types default value.