fix typo in Text doc

text/text.go

@@ -43,7 +43,7 @@ func RangeTable(table *unicode.RangeTable) []rune {
 //   txt := text.New(face, text.ASCII)
 //
 // As suggested by the constructor, a Text object is always associated with one font face and a
-// fixed set of runes. For example, the Text we create above can draw text using the font face
+// fixed set of runes. For example, the Text we created above can draw text using the font face
 // contained in the `face` variable and is capable of drawing ASCII characters.
 //
 // Here we create a Text object which can draw ASCII and Katakana characters: