s1: Fix comment typo.

Fixes #55.

Author: dsymonds

s1/angle.go

@@ -22,7 +22,7 @@ import (
 // Angle represents a 1D angle. The internal representation is a double precision
 // value in radians, so conversion to and from radians is exact.
 // Conversions between E5, E6, E7, and Degrees are not always
-// exact. For example, Degrees(3.1) is different from E6(3100000) or E7(310000000).
+// exact. For example, Degrees(3.1) is different from E6(3100000) or E7(31000000).
 //
 // The following conversions between degrees and radians are exact:
 //