wrapping in 80 char

doc/guides/writing-tests.md

@@ -23,7 +23,7 @@ Add tests when:
 See [directory structure overview][] for outline of existing test & locations.
 When deciding on whether to expand an existing test file or create a new one,
 consider going through the files related to the subsystem.
-For example viewing tests for `test-streams` when writing a test for `lib/streams.js`.
+For example, look for `test-streams` when writing a test for `lib/streams.js`.
 
 ## Test structure