lowercase option name

Author: mmcky

lectures/_config.yml

@@ -46,13 +46,13 @@ sphinx:
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png
       description: This website presents a set of lectures on python programming for economics, designed and written by Thomas J. Sargent and John Stachurski.
       keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
+      enable_rtl: True
       analytics:
         google_analytics_id: G-X7DH1M2DPY
       launch_buttons:
         notebook_interface        : classic  # The interface interactive links will activate ["classic", "jupyterlab"]
         colab_url                 : https://colab.research.google.com
         thebe                     : false  # Add a thebe button to pages (requires the repository to run on Binder)
-      enable_RTL: True
     mathjax_path: https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
     rediraffe_redirects:
       index_toc.md: intro.md