Be more specific in "Loading logging rules" debug output

Change-Id: I8a6f1797cbcfabc6df76ce17115a678f729ac711
Reviewed-by: hjk <hjk121@nokiamail.com>

src/corelib/io/qloggingregistry.cpp

@@ -341,7 +341,7 @@ void QLoggingRegistry::setApiRules(const QString &content)
     QMutexLocker locker(&registryMutex);
 
     if (qtLoggingDebug())
-        debugMsg("Loading logging rules set by Qt API ...");
+        debugMsg("Loading logging rules set by QLoggingCategory::setFilterRules ...");
 
     apiRules = parser.rules();