Merge pull request #3840 from plotly/LiamConnors-patch-2

Fix typo

Author: nicolaskruchten

Diff for: contributing.md

@@ -24,7 +24,7 @@ the structure of the code and of the repository.
   in `packages/python/plotly/codegen`. Most of the codegen code concerns the generation of docstrings from
   the schema JSON in Plotly.js. Traces and
   Layout classes have a direct correspondence with their Javascript
-  counterpart. Higher-level methods that work on on figures regardless of the current schema (e.g., `BaseFigure.for_each_trace`) are defined in `packages/python/plotly/plotly/basedatatypes.py`. Additional helper methods are defined there for the `Figure` object, such as
+  counterpart. Higher-level methods that work on figures regardless of the current schema (e.g., `BaseFigure.for_each_trace`) are defined in `packages/python/plotly/plotly/basedatatypes.py`. Additional helper methods are defined there for the `Figure` object, such as
   `update_layout`, `add_trace`, etc.
 
 - [the `plotly.express` module](https://plotly.com/python/plotly-express/) (usually imported as `px`) is a high-level