[array.overview] Don't mention swap as an exception

The container requirements already describe this behavior,
so from the POV of this subclause, there's no exception.

Author: JohelEGP

source/containers.tex

@@ -6123,8 +6123,8 @@
 of a container\iref{container.reqmts} and
 of a reversible container\iref{container.rev.reqmts},
 except that a default
-constructed \tcode{array} object is not empty and that \tcode{swap} does not have constant
-complexity. An \tcode{array} meets some of the requirements of a sequence
+constructed \tcode{array} object is not empty.
+An \tcode{array} meets some of the requirements of a sequence
 container\iref{sequence.reqmts}.
 Descriptions are provided here
 only for operations on \tcode{array} that are not described in