[intro.scope] Modernize by removing overly verbose description

Fixes NB GB01-013 (C++26 CD).

Author: jensmaurer

source/intro.tex

@@ -16,19 +16,11 @@
 \pnum
 \indextext{scope|(}%
 This document specifies requirements for implementations
-of the \Cpp{} programming language. The first such requirement is that
+of \Cpp{}, which is a general-purpose programming language.
+The first such requirement is that
 an implementation implements the language, so this document also
 defines \Cpp{}. Other requirements and relaxations of the first
 requirement appear at various places within this document.
-
-\pnum
-\Cpp{} is a general purpose programming language based on the C
-programming language as described in \IsoC{}.
-\Cpp{} provides many facilities
-beyond those provided by C, including additional data types,
-classes, templates, exceptions, namespaces, operator
-overloading, function name overloading, references, free store
-management operators, and additional library facilities.%
 \indextext{scope|)}
 
 \rSec0[intro.refs]{Normative references}%