numberFormatting description doesn't mention case

[jrose-signal]

In lint mode, I got the following warning:

Use consistent grouping for numeric literals. Groups will be separated by _ delimiters to improve readability. For each numeric type you can specify a group size (the number of digits in each group) and a threshold (the minimum number of digits in a number before grouping is applied). (numberFormatting)

But looking at the line, there wasn't any grouping to be had:

let contrivedExample: [UInt8] = [0x52, 0xb8, 0x99, 0xef]

It turns out it was complaining about using lowercase hex instead of uppercase (a non-lint run made the change for me). That's fine, it still fits the category of "numberFormatting", but the description should say so.