run-tests.sh: fix comment

Change-Id: I300fc00c59fd5386ff853e30bc6f8c1999e99a0a
Reviewed-on: https://code-review.googlesource.com/27410
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/run-tests.sh b/run-tests.sh
index f47ff50..a643e61 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -70,8 +70,8 @@
   return 1
 }
 
-# Collect the packages into two separate lists. (It is faster go test a list of
-# packages than to individually go test each one.)
+# Collect the packages into two separate lists. (It is faster to call "go test" on a
+# list of packages than to individually "go test" each one.)
 
 shorts=
 fulls=