Fix broken hyperlink in README.

[raeganbarker]

Purpose

Fixes a broken hyperlink in the README.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[X] Other... Please describe: Documentation fixes

How to Test

N/A - Documentation change only

What to Check

N/A - Documentation change only

Other Information

N/A