chore(developers.md): change comma typo

[efueyo]

Description

This is a small change in developers.md documentation.
the table results in

 results = {
        { "red", "#ff0000" },
        { "green", "#00ff00" },
        { "blue", "#0000ff" },
      },

contains the name AND the hex code. With the previous text, it seemed that the table had a "color", a "name" and the "hex code" and I found it confusing.

I understand that this is an extremely small nit picking so its up to you guys if you want to move ahead and skip this PR :)

Type of change

• Just a documentation update

How Has This Been Tested?

N/A

Configuration:

• Neovim version (nvim --version): NVIM v0.11.0-dev+212-gd8e384b7b
• Operating system and version: Fedora 40

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[Conni2461]

thanks :)