update remapping.md: clarify difference in modifiers between non-character and character bindings

[DrymarchonShaun]

Documenting the difference between using shift as a modifier for a special key and a character key. See #8831 and #9197

[the-mikedavis]

Let's fix this rather than document it as you said in #8831 (reply in thread)

[DrymarchonShaun]

That's fine by me. Actually implementing it was beyond my skill set, the best I could do personally was document it.

Should I close this then?

[the-mikedavis]

Yep let's close this in favor of #9213