CPP11 — boxed types for floating point values

Summary: In ptc/98-08-03 p.20-80:

For all the integer types, boolean, octet, char, wchar and
enumerated types, value box classes provide.

1. The phrase "integer types" should presumably read "integer types except for
fixed" in view of the separate mapping for fixed type on p. 20-85. It
is true that "integer type" can mean signed_int or unsigned_int, in
contexts such as Corba 2.3a grammar, but the phrase here seems
potentially ambigous.

2. The phrase should be extended to include floating point types
(including float, double, and long double).

Clarify the text.