spelling: exception

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

src/lib/barrier/XBarrier.h

@@ -111,7 +111,7 @@ private:
     std::string                m_name;
 };
 
-//! Generic exit eception
+//! Generic exit exception
 /*!
 Thrown when we want to abort, with the opportunity to clean up. This is a
 little bit of a hack, but it's a better way of exiting, than just calling