Fix todo example

[Yusyuriv]

I encountered an issue in a project I'm contributing to: gitStream would request changes saying my PR has a todo in it, even though I didn't add any todos. I asked another team member if they know what the issue is, and they figured it out: our todo regex was copied from the example in the docs, and that example is incorrect. The current example:

/^[+].*(TODO)|(todo)/

It matches:

1. either a line starting with a plus sign, followed by any amount of any characters, followed by TODO (uppercase)
2. or it matches any line that has todo (lowercase) in it, ignoring the ^[+].* part

Because of the second part, it reacted to a todo comment I had deleted. This PR fixes this issue by placing both variants (TODO and todo) inside the same group.

Demo on regex101: before the change, after the change

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[BenLloydPearson]

Thanks for the fix @Yusyuriv This is super helpful!

[vim-zz]

Thank you Yan!