text.Rich to implement Stringer; extra docs

text/text.go

@@ -7,10 +7,16 @@ type Rich struct {
 	Segments []Segment
 }
 
+// Empty returns whether or not the rich text is considered empty.
 func (r Rich) Empty() bool {
 	return r.Content == ""
 }
 
+// String returns the content. This is used mainly for printing.
+func (r Rich) String() string {
+	return r.Content
+}
+
 // Segment is the minimum requirement for a format segment. Frontends will use
 // this to determine when the format starts and ends. They will also assert this
 // interface to any other formatting interface, including Linker, Colorer and