Fix capitalization of GitHub in intro

Author: mchammer01

src/fixtures/fixtures/content/get-started/start-your-journey/api-article-body-test-page.md

@@ -1,7 +1,7 @@
 ---
 title: Api Article Body Test Page
 shortTitle: About GitHub and Git
-intro: 'You can use Github and Git to collaborate on work.'
+intro: 'You can use GitHub and Git to collaborate on work.'
 versions:
   fpt: '*'
   ghes: '*'