internal/gen: doc exported symbols (#9)

internal/gen/ctors.go

@@ -15,6 +15,9 @@ type ctors struct {
 	prnt.Generator
 }
 
+// NewCtors will build instruction constructors. Each constructor will check
+// that the provided operands match one of the allowed instruction forms. If so
+// it will return an Instruction object that can be added to an avo Function.
 func NewCtors(cfg printer.Config) Interface {
 	return GoFmt(&ctors{cfg: cfg})
 }