Tweak the expected doxygen errors

Author: martin

scripts/expected_doxygen_warnings.txt

@@ -84,7 +84,7 @@ warning: Included by graph for 'goto_functions.h' not generated, too many nodes
 warning: Included by graph for 'goto_model.h' not generated, too many nodes (110), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'arith_tools.h' not generated, too many nodes (181), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'c_types.h' not generated, too many nodes (110), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
-warning: Included by graph for 'config.h' not generated, too many nodes (85), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
+warning: Included by graph for 'config.h' not generated, too many nodes (87), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'exception_utils.h' not generated, too many nodes (61), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'expr.h' not generated, too many nodes (87), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'expr_util.h' not generated, too many nodes (61), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.