Document Esc key behaviour more clearly

[blaxpot]

The issue is already reported or known issue?

• I have searched the existing issues on github
• I am using the latest version

Description

Very minor suggestion, and maybe it's just me being a derp, but it took me longer than it should have to figure out that hitting Esc a few times on pages where the cursor is automatically placed in an input field will move my cursor out of the field and thus let me use Vimmatic keybinds.

Probably should have been pretty intuitive since mashing Esc in Vim is a thing I do if I'm in the wrong mode or whatever, but it didn't quite click for me right away. Probably 'cos I'm a bit set in my ways with how I interact with a web browser (sites with custom right click menu stuff always trip me up too).

I'm not really sure what Esc behaviour is just default for my browser / other browsers and whether Vimmatic even modifies it OTTOMH, so figured I'd just share my thoughts here. Hopefully this is the right place for this. Feel free to ignore if you don't think any guidance about this is needed in the docs for whatever reason.

Other details

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