EN: grammar tweaks, clarity changes, dead link in README

[AwesomeTornado]

This pull request contains the following:

• Minor grammar changes
• Rewording of some confusing descriptions
• New link for the README

Minor grammar changes

These changes are in the exact same style as my previous pull request, linked here, with the following description:

There were a few strings with confusing grammar consisting of a question being used as a statement.
I think it's called a subject-auxiliary verb inversion? I'm not a linguistics major though, so I'm not sure.
Example below:
Old version:
this controls what will [something] do
New version:
this controls what [something] will do

Rewording of some confusing descriptions

I have changed how the double click interval and the noise gate are explained. I believe that the updated descriptions do a better job of explaining what these settings actually do, however I would appreciate some confirmation here.

New link for the README

This is a fix for issue #332. Using the Internet Archive, I was able to determine which of the two links referenced in the issue was the intended link.
The Internet archive link I used can be found below.
http://web.archive.org/web/20201108210300/https://messageformat.github.io/messageformat/page-guide
Credit to @Banane9 for doing all of the work for this part, all I have really done is created the PR.

[Banane9]

Glad someone picked up fixing that :D

[Frooxius]

Thank you for the tweaks!