Add the possibility to disable multiple matches

[Tiv0w]

Hi!
When using eldoc, I don't like the need to match a single candidate via completing-read when there are multiple candidates.

I use company (with the company-box frontend), and it's already showing me all possible signatures. Having to interrupt my completion to match a candidate to show its signature is breaking my user experience.

I suggest a new user-customizable variable to let users choose whether or not they want the "multiple matches" prompt.
If set to nil, racer--describe-at-point could show the first match, and add a hint to specify there are more possible signatures.
Something like racer-eldoc-prompt-for-multiple-matches could do the trick.

Thanks in advance for the response.