docs: fix simple typo, specfic -> specific

There is a small typo in contributing.md.

Should read `specific` rather than `specfic`.

Author: timgates42

Diff for: contributing.md

@@ -280,7 +280,7 @@ pytest  packages/python/plotly/plotly/tests/test_core/
 pytest plotly/tests/test_plotly/test_plot.py
 ```
 
-or for a specfic test function
+or for a specific test function
 
 ```bash
 pytest plotly/tests/test_plotly/test_plot.py::test_function