Fix typo in upgrading docs

packages/website/content/guides/upgrading-to-1-0.mdx

@@ -108,7 +108,7 @@ const oldBullettedList = {
 
 - Ability to add new formats and content, or modify existing ones with [Parchment](https://github.com/quilljs/parchment/).
 
-- Added support for nested list, superscript, subscript, inline code, code block, header, blockquote, text direction, video and forumla support.
+- Added support for nested list, superscript, subscript, inline code, code block, header, blockquote, text direction, video and formula support.
 
 - Ability to format with classes instead of inline styles.