Change Github to GitHub. (gatsbyjs#15115)

docs/blog/2019-06-17-day-in-the-life-of-a-core-maintainer/index.md

@@ -9,7 +9,7 @@ tags:
   - contributor
 ---
 
-_Note: A "core maintainer" is an official member of the Gatsby team--you'll see them around Github day-to-day and they're accessible via the `@gatsbyjs/core` team. Gatsby Core is the open-source Gatsby you know and love, e.g. [gatsbyjs/gatsby](https://github.com/gatsbyjs/gatsby)._
+_Note: A "core maintainer" is an official member of the Gatsby team--you'll see them around GitHub day-to-day and they're accessible via the `@gatsbyjs/core` team. Gatsby Core is the open-source Gatsby you know and love, e.g. [gatsbyjs/gatsby](https://github.com/gatsbyjs/gatsby)._
 
 The day-to-day responsibilities of a core maintainer are some of the most challenging of any in the organization. Constantly being pulled in many, seemingly infinite directions leads to a feeling that it's challenging to get productive work accomplished. Balancing community needs, internally surfaced issues and support requests, and a desire to work on substantive bug-fixes and features is a **hard problem.**
 

docs/starters.yml

@@ -179,8 +179,8 @@
     - Portfolio
     - Onepage
   features:
-    - Use your Github as your own portfolio site
-    - List your Github repositories
+    - Use your GitHub as your own portfolio site
+    - List your GitHub repositories
     - GitHub GraphQL API v4
 - url: https://gatsby-starter-blog-demo.netlify.com/
   repo: https://github.com/gatsbyjs/gatsby-starter-blog
@@ -2867,7 +2867,7 @@
     - Code diffing with +/-
     - Google Analytics Integration
     - SEO Tags with MDX frontmatter
-    - Edit on Github button
+    - Edit on GitHub button
     - Fully Customisable with rich embeds using React in MDX.
 - url: https://gatsby-starter-blog-with-lunr.netlify.com/
   repo: https://github.com/lukewhitehouse/gatsby-starter-blog-with-lunr