Update quickstart-for-writing-on-github.md (#34553)

Co-authored-by: Alex Nguyen <[email protected]>

content/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/quickstart-for-writing-on-github.md

@@ -112,7 +112,7 @@ Hi, I'm Mona. You might recognize me as {% data variables.product.prodname_dotco
 
 ## Adding a collapsed section
 
-To keep your content tidy, you can use the `<details>` tag to create an expandible collapsed section.
+To keep your content tidy, you can use the `<details>` tag to create an expandable collapsed section.
 
 1. To create a collapsed section for the table you created, wrap your table in `<details>` tags like in the following example.