manual: Refactor documentation of CHAR_BIT.

[Rical Jasan]

This single-@item @table is better defined with @defvr, since the
CHAR_BIT macro has @standards (being declared in a header), and @items
in @tables are not considered annotatable.  Using @defvr automatically
includes the macro in the Variable and Constant Macro Index and
ensures its inclusion the Summary of Library Facilities.  The file
include/limits.h identifies the macro as coming from C99.

	* manual/lang.texi (CHAR_BIT): Convert from an @table to an
	@defvr.  Change standard from ISO to C99.
---
 manual/lang.texi | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
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