ADA13 — 21.2.7 Mapping Summary - Names and Scoping

Summary: Delete the paragraph:

" This mapping supports the introduction of a subsystem name
that serves as a root virtual module for all declarations
in one or more files. When specified, subsystems create a
library package. "

The concept of subsystem is nowhere further explained.
I believe this might be a remainder from the time when the
#pragma Subsystem was supported.

Accept the proposed resolution; this is holdover from the removal of the pragma
Subsystem feature proposed initially. However, referencing text needs to be deleted in
both 1.3.1 and 1.9