tdf#44502 cppuhelper: fix doxygen warning

Change-Id: If1bb3d7cc37449fc6be5467dc5d4380083d66211
diff --git a/include/cppuhelper/propshlp.hxx b/include/cppuhelper/propshlp.hxx
index 2befe21..a546f5c 100644
--- a/include/cppuhelper/propshlp.hxx
+++ b/include/cppuhelper/propshlp.hxx
@@ -558,8 +558,8 @@ protected:
       @param rValue the value to be converted
       @return true if the value converted.
       @throws css::lang::IllegalArgumentException
       @throws css::beans::UnknownPropertyException,
       @thrwos css::uno::RuntimeException
       @throws css::beans::UnknownPropertyException
       @throws css::uno::RuntimeException
     */
    virtual sal_Bool SAL_CALL convertFastPropertyValue(
        css::uno::Any & rConvertedValue,