Fix interfaces typo

examples/interfaces/interfaces.go

@@ -56,7 +56,7 @@ func main() {
     // The `circle` and `square` struct types both
     // implement the `geometry` interface so we can use
     // instances of
-    // these structs as arguments to `measure.
+    // these structs as arguments to `measure`.
     measure(s)
     measure(c)
 }

examples/interfaces/interfaces.hash

@@ -1,2 +1,2 @@
-853be73c5685a0510da77c22c64727afa7fb0581
-vx8bwC-Bmq
+9bafbade1f5effc38be233c3fd12cbdd7c6e226d
+guxTzcucR-