fix #932 - Add embed gist instructions to Embed Files

[MichaelCurrin]

Summary

Added gist instructions to Embed Files page. Closes #982.

Also cleaned up the grammar on the first part of the page.

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

Other information:

---

• DO NOT include files inside lib directory.

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[MichaelCurrin]

I'll check the live preview tomorrow - I am having internet issues today.

[MichaelCurrin]

Can I request a small demo gist created under docsify account? Then I can have a live example I can use in my PR.

One gist with three files such as:

• content.md

  This is a **markdown** file in a gist.

• script.js

  console.log("This is a script in a gist");

• README.md

  This gist is used for example content on the docs - see the [Embed Files](https://docsify.js.org/#/embed-files) section.
  

The README just being an explanation in case anyone stumbles on the gist directly.

[anikethsaha]

@MichaelCurrin here you go https://gist.github.com/anikethsaha/f88893bb563bb7229d6e575db53a8c15

[MichaelCurrin]

@anikethsaha Perfect, thanks! I've used your gist and done some other cleanup.

[anikethsaha]

Awesome , thanks