Fix typo

Change-Id: I95b12975f6444e7eb6a8de6053d8e8ca021eacfb
Reviewed-on: https://gerrit.libreoffice.org/56069
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

dbaccess/source/core/dataaccess/datasource.cxx

@@ -597,7 +597,7 @@ Reference< XConnection > ODatabaseSource::buildLowLevelConnection(const OUString
         }
         if (bNeedMigration)
         {
-            // back up content xml file if migration was successfull
+            // back up content xml file if migration was successful
             Reference<XStorage> xRootStorage = m_pImpl->getOrCreateRootStorage();
             xRootStorage->copyElementTo("content.xml", xRootStorage,
                     "content_before_migration.xml");