Changes 'the' to 'then' in stateful goroutine example (#427)

* Changes 'the' to 'then' in stateful goroutine example

* Run tools/build to update HTML

examples/stateful-goroutines/stateful-goroutines.go

@@ -71,7 +71,7 @@ func main() {
 	// This starts 100 goroutines to issue reads to the
 	// state-owning goroutine via the `reads` channel.
 	// Each read requires constructing a `readOp`, sending
-	// it over the `reads` channel, and the receiving the
+	// it over the `reads` channel, and then receiving the
 	// result over the provided `resp` channel.
 	for r := 0; r < 100; r++ {
 		go func() {

examples/stateful-goroutines/stateful-goroutines.hash

@@ -1,2 +1,2 @@
-9c73569ad2e16252b04fe171618db4c5fd09efb7
-5mf_P9xqBzk
+04a59d09868df58e9edf5930d38efd25cbb92861
+TBcWd-OfnaA