fix typo in comments

options.go

@@ -62,11 +62,11 @@ type Angle int
 const (
 	// D0 represents the rotation angle 0 degrees.
 	D0 Angle = 0
-	// D45 represents the rotation angle 90 degrees.
+	// D45 represents the rotation angle 45 degrees.
 	D45 Angle = 45
 	// D90 represents the rotation angle 90 degrees.
 	D90 Angle = 90
-	// D135 represents the rotation angle 90 degrees.
+	// D135 represents the rotation angle 135 degrees.
 	D135 Angle = 135
 	// D180 represents the rotation angle 180 degrees.
 	D180 Angle = 180
@@ -74,7 +74,7 @@ const (
 	D235 Angle = 235
 	// D270 represents the rotation angle 270 degrees.
 	D270 Angle = 270
-	// D315 represents the rotation angle 180 degrees.
+	// D315 represents the rotation angle 315 degrees.
 	D315 Angle = 315
 )