manual: Convert @tables of variables to @vtables.

	Using a @vtable provides a context for processing @items
	whereby it can be known the @items should have header and
	standards annotations.  This commit converts @tables of such
	@items to @vtables, which also results in the addition of 76
	new entries to the Variable and Constant Macro Index (13 of
	which are in addition to previously existing entries), and the
	removal of 11 (NSS), due to the automatic indexing.

	The @vtable of the NSS databases is converted to a @table
	because 1) those @items are not rightly variables, and 2) they
	do not need header and standards annotations, so the incorrect
	context is fixed.

	* manual/filesys.texi: Convert @tables of variables to
	@vtables.
	* manual/llio.texi: Likewise.
	* manual/memory.texi: Likewise.
	* manual/process.texi: Likewise.
	* manual/resource.texi: Likewise.
	* manual/search.texi: Likewise.
	* manual/sysinfo.texi: Likewise.
	* manual/syslog.texi: Likewise.
	* manual/terminal.texi: Likewise.
	* manual/time.texi: Likewise.
	* manual/nss.texi: Change incorrect @vtable to @table.
---
 manual/filesys.texi  |  6 ++----
 manual/llio.texi     | 20 ++++++++++----------
 manual/memory.texi   |  8 ++++----
 manual/nss.texi      |  4 ++--
 manual/process.texi  |  8 ++++----
 manual/resource.texi | 26 ++++++++------------------
 manual/search.texi   |  4 ++--
 manual/sysinfo.texi  |  8 ++++----
 manual/syslog.texi   |  4 ++--
 manual/terminal.texi | 15 ++++-----------
 manual/time.texi     |  4 ++--
 11 files changed, 44 insertions(+), 63 deletions(-)