Use more idiomatic function name for content setter in pager

pager/pager.go

@@ -29,7 +29,7 @@ func (m Model) ScrollPercent() float64 {
 }
 
 // Content set the pager's text content
-func (m *Model) Content(s string) {
+func (m *Model) SetContent(s string) {
 	s = strings.Replace(s, "\r\n", "\n", -1) // normalize line endings
 	m.lines = strings.Split(s, "\n")
 }