Doc: Fix broken links (explicit intra-module qualifiers)

All these links are intra-module, so these qualifiers should not have
been required. Might be an indication of a QDoc bug.

Task-number: QTBUG-37719
Change-Id: I791ad767f1eb33c52b96de451ee0601a0b7c12dd
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>