[any.cons] Use 'contained value', not 'contained object'. (#1582)

Fixes #1580.

Author: jensmaurer

source/utilities.tex

@@ -5599,7 +5599,7 @@
 \effects
 If \tcode{other.has_value()} is \tcode{false}, constructs an object that has no value.
 Otherwise, equivalent to \tcode{any(in_place<T>, any_cast<const T\&>(other))}
-where \tcode{T} is the type of the contained object.
+where \tcode{T} is the type of the contained value.
 
 \pnum
 \throws
@@ -5616,9 +5616,9 @@
 \effects
 If \tcode{other.has_value()} is \tcode{false}, constructs an object that has no value.
 Otherwise, constructs an object of type \tcode{any} that
-contains either the contained object of \tcode{other}, or
+contains either the contained value of \tcode{other}, or
 contains an object of the same type constructed from
-the contained object of \tcode{other} considering that contained object as an rvalue.
+the contained value of \tcode{other} considering that contained value as an rvalue.
 
 \pnum
 \postconditions