Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -31,7 +31,7 @@ The following is a set of guidelines for contributing to ISIS3.
   * [Redmine Issue Lifecycle](https://isis.astrogeology.usgs.gov/fixit/projects/isis/wiki/Life_Cycle_of_an_ISIS_Issue)
   * ADD MORE THINGS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   
-## Redmine Issue
+## Redmine Issues
 If you have a problem or a suggestion for a future software feature, please read our [Guidelines for reporting Redmine issues](https://isis.astrogeology.usgs.gov/fixit/projects/isis/wiki/Guidelines_for_Reporting_Issues). Once you have read that please [submit](https://isis.astrogeology.usgs.gov/fixit/projects/isis/issues/new) a Redmine issue.
 
 ## How can I contribute?