Fix button press event syntax in share.md

Author: oblomov-dev

docs/development/navigation/share.md

@@ -23,7 +23,7 @@ CLASS z2ui5_cl_sample_share IMPLEMENTATION.
                          )->input( client->_bind_edit( mv_quantity )
                          )->button(
                              text  = `share`
-                             press = client->_event( val = `BUTTON_POST` )
+                             press = client->_event( `BUTTON_POST` )
               )->stringify( ) ).
     ENDIF.