[Register command] Parameter comments with ":" are not parsed

[BurtBiel]

Instead the comment is blank. This frequently happens with text like "Example: ..."

[tjprescott]

Burt Bielicki (@BurtBiel) does this happen when the text comes from a docstring, alias, help file, or all of the above?

[BurtBiel]

Travis Prescott (@tjprescott) I saw this behavior with the register argument syntax. We had this issue in the past, but I thought it got fixed.

[tjprescott]

I've identified a case where this occurs: az storage table query -h.