Tweak regenerate example instructions

Author: softwareengineerprogrammer

tests/test_geophires_x.py

@@ -210,8 +210,8 @@ def get_output_file_for_example(example_file: str):
                         if percent_diff is not None:
                             msg = (
                                 f'Results are approximately equal within {percent_diff}%. '
-                                f'(Run `regenerate-example-result.sh {example_file_path.split(".")[0]}` '
-                                f'from tests/ if this difference is expected due to calculation updates)'
+                                f'(Run `./tests/regenerate-example-result.sh {example_file_path.split(".")[0]}` '
+                                f'if this difference is expected due to calculation updates)'
                             )
 
                         raise AssertionError(msg) from ae