Minor fix to currentTime() comment: "setting" not "getting"

[andrewagain]

Description

This is an extremely minor fix to a mistake/type comment on the currentTime() method. But I think it's important that it be fixed - I found it confusing.

Specific Changes proposed

It's basically a one character change to a comment.

Requirements Checklist

• N/A Feature implemented / Bug fixed
• N/A If necessary, more likely in a feature request than a bug fix
  • N/A Change has been verified in an actual browser (Chome, Firefox, IE)
  • N/A Unit Tests updated or fixed
  • Docs/guides updated
  • N/A Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[gkatsev]

Thanks!