docs: update about.mdx to remove extra word (#177)

Author: mannycarrera4

docs/tutorialkit.dev/src/content/docs/guides/about.mdx

@@ -5,7 +5,7 @@ description: "TutorialKit: Overview and Capabilities"
 
 TutorialKit is an open source tool that enables you to create interactive code tutorials for your UI library or Javascript framework without having to implement the necessary user interface or the underlying logic.
 
-TutorialKit enables you to spin spin up a live interactive tutorial site in minutes complete with:
+TutorialKit enables you to spin up a live interactive tutorial site in minutes complete with:
 
 - Code editor with syntax highlighting
 - Live dev server preview that updates as learners experiment with your tutorial code