feat(docs): Changed View Code to Edit Code

[ryanseddon]

Description

All the code examples currently have a "View Code" button below the live examples, it's not clear from that that you can actually edit the code to change the live example.

This PR changes it to "Edit Code".

Detail

Before

After

Checklist

• 👌 design updates are Garden Designer approved (add the
  designer as a reviewer)
• 💅 view component styling is based on a Garden CSS
  component
• 🌐 Styleguidist demo is up-to-date (yarn start)
• ⬅️ renders as expected with reversed (RTL) direction
• 💂‍♂️ includes new unit and snapshot tests
• 📒 any new files are included in the packages src/index.js export
• 📝 tested in Chrome, Firefox, Safari, Edge, and IE11

[coveralls]

Coverage remained the same at 95.835% when pulling a46f928 on ryan/change_styleguidist_code_button into 7f48bb8 on master.