I tweaked this a little bit to get rid of the dashes. Instead of replacing the Revision or Issue you don't want listed with a dash, I replaced them with the header title (Date, Description, No., etc.). Then just add another calculated value called Sequence for your sorting. For example:

In the Issue Schedule, use:
No:
if(Revision Sequence < 9, Revision Number, "No.")
Description:
if(Revision Sequence < 9, Revision Description, "Description")
Date:
if(Revision Sequence < 9, Revision Date, "Date")
Sequence:
if(Revision Sequence < 9, Revision Sequence, "0")

In the Revision Schedule, use:
No:
if(Revision Sequence > 10, Revision Number, "No.")
Description:
if(Revision Sequence < 10, Revision Description, "Description")
Date:
if(Revision Sequence < 10, Revision Date, "Date")
Sequence:
if(Revision Sequence < 10, Revision Sequence, "10")

Sort by your calculated value Sequence, and this first value becomes your headings, with the revisions/issues listed below.