Fix instructions for completion in Oh My Zsh

[Stigjb]

Fixes exercism/exercism#5029

Also cf. #865

Changed oh-my-zsh to Oh My Zsh to match the style in the official repo

[kytrinyx]

This looks great, so sorry I missed the original ping and made you wait for a month for feedback!

I have one question as the copy command looks surprising to me, but otherwise this is ready to go.

[Stigjb]

Ping 😄

[haus]

Might be worth adding a note about clearing the completion cache (https://github.com/ohmyzsh/ohmyzsh/wiki/FAQ#i-have-enabled-a-completion-plugin-but-the-completion-doesnt-work). This had me tripped up for quite a while before I got it working.

[NoZiL]

This works well and should be merged 👍

[kotp]

Approving, but @haus or @NoZiL could add note on clearing the cache??

[NoZiL]

I didn't encounter any cache problems with a clean install, and there seems to be a note stating that the completion is now checking the plugin list on their wiki
I can add a note about updating OhMyZsh to the latest version that should fix any completion problem.

[allentiak]

@Stigjb Could you please help me understand why does one of the checks fail?

[Stigjb]

@allentiak I do not know why it failed, but it succeeded after updating the PR with the main branch

[allentiak]

@kotp @kytrinyx What else is needed for this to be merged?

[kotp]

I would merge, but I don't have the appropriate rights.

Give it a day or so, we should hear something back.

[allentiak]

Thanks!