fix typo

Change-Id: I3a1ae61f1d6aff3129937dbf584eaec6b7f002b8
diff --git a/include/comphelper/servicehelper.hxx b/include/comphelper/servicehelper.hxx
index a96285e..73064cd 100644
--- a/include/comphelper/servicehelper.hxx
+++ b/include/comphelper/servicehelper.hxx
@@ -46,7 +46,7 @@ public:
    Usage:
        Put a UNO3_GETIMPLEMENTATION_DECL( classname ) inside your class
        definitian and UNO3_GETIMPLEMENTATION_IMPL( classname ) inside
        your cxx file. Your class must inherit ::com::sun::star::uno::XUnoTunnel
        your cxx file. Your class must inherit ::com::sun::star::lang::XUnoTunnel
        and export it with queryInterface. Implementation of XUnoTunnel is
        done by this macro.
*/