PSUseApprovedVerbs rule marks whole function at beginning of file

[daviwil]

@pcgeek86 and @dsolodow reported an issue at PowerShell/vscode-powershell#132 which states that the PSUseApprovedVerbs rule marks the entire function instead of just the function name if the function comes at the very beginning of the file without any newline before it. Here's a screenshot:

If I put one newline in front of the first function, the extent is marked correctly:

Seems like there must be an issue with the extent calculation here.