Fixed username JSDoc type.
Fixed username JSDoc type.

Change-Id: Ie5f09e2bbb897e8228b2b5d528f69721622f55b8
Reviewed-on: http://review.couchbase.org/c/couchnode/+/135938
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

couchbase/couchnode,brett19/couchnode,brett19/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode