Capitalise mode's display name

[frou]

It's conventional for a mode's display name to be capitalised. At the moment, it looks weird to have a component of the mode-line be all-lowercase 😅

[xvw]

Thanks a lot!
Can you maybe a change entry (in CHANGES.md)?

ocaml-eglot unreleased
======================

- Fix lighter case ([#26](https://github.com/tarides/ocaml-eglot/pull/26))

<Rest of the document>

Thanks in advance!

[frou]

Done. I now noticed you don't capitalise the 'E' elsewhere so rolled that part back.

[xvw]

Thanks!

[frou]

Thank you for the fantastic project. It's a really great initiative so that Emacs doesn't get left behind!