Fix hyperlink in documentation

Author: paulromano

docs/source/developers.rst

@@ -11,7 +11,7 @@ Active development of the OpenMC Monte Carlo code is currently led by:
 * `Nick Horelik <https://github.com/nhorelik>`_
 * `Adam Nelson <https://github.com/nelsonag>`_
 * `Jon Walsh <https://github.com/walshjon>`_
-* `Sterling Harper <https://github.com/walshjon>`_
+* `Sterling Harper <https://github.com/smharper>`_
 * `Will Boyd <https://github.com/wbinventor>`_
 * `Benoit Forget <http://web.mit.edu/nse/people/faculty/forget.html>`_
 * `Kord Smith <http://web.mit.edu/nse/people/faculty/smith.html>`_