Change an F to an R as a typo fix [JIRA: CLIENTS-1038]

[genericProgramming]

Context

FiakFutureListener isn't a thing, but RiakFutureListener is.

Expected Behavior

A user should read 'RiakFutureListener' in the javadoc

Actual Behavior

A user reads 'FiakFutureListener' in the javadoc, and is subsequently so confused that they decide to give up writing code and become a 'scrum master'.

Possible Fix

Someone else makes the change from an F to an R

Steps to Reproduce

1. Look at the docs

Context

I chuckled, and then opened this issue/PR. Then, after all of this typing for a one letter change, I also questioned my ability to properly manage time.

Your Environment

• [ 2.0.7] Riak Java Client version
• [8 ] Java version
• [ ] Riak version
• [ ] Operating System / Distribution & Version
• [ ] Riak's error.log file, if applicable
• [ ] What methods were being executed during the error
• [ ] What you expected to have happen
• [ ] Sample data, if applicable

[Basho-JIRA]

Fixed, or closed via GitHub issues.

[posted via JIRA by Alexander Moore]