Fix typo in reference docs
Merge pull request #328 from lonre/typo-fix

# By Lonre Wang
* typo-fix:
  Fix typo in reference docs
Avoid use of repeated @Scheduled in tests

Commented out severalFixedRatesWithRepeatedScheduledAnnotation() until
we have full Java 8 support in the IDEs (e.g., Eclipse).

Issue: SPR-10532