Fix typos

Change-Id: I90b04b8eda6fc3d530c9db72052720cbe9de0343
Reviewed-on: https://gerrit.libreoffice.org/21197
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
Tested-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

compilerplugins/clang/refcounting.cxx

@@ -159,7 +159,7 @@ bool containsXInterfaceSubclass(const Type* pType0) {
     const CXXRecordDecl* pRecordDecl = pType->getAsCXXRecordDecl();
     if (pRecordDecl) {
         pRecordDecl = pRecordDecl->getCanonicalDecl();
-        // these classes override acquire/release and forwards to it's parent
+        // these classes override acquire/release and forwards to its parent
         if (isDerivedFrom(pRecordDecl, "ListenerMultiplexerBase")) { // module UnoTools
             return false;
         }