[doc] fix documentation of -fvtable-verify and related options

[Sandra Loosemore]

This patch cleans up the documentation of -fvtable-verify, -fvtv-debug, 
and -fvtv-counts.  The substantive change is to correct the location of 
the debug log files per discussion here:

https://gcc.gnu.org/ml/gcc/2015-01/msg00029.html

but I ended up doing a pretty much total rewrite of the text to fix 
various markup problems, issues with agreement of verb tense and 
plurals, usage of terms like "runtime", etc.

I think this particular patch goes a little beyond an obvious fix, so I 
have not committed it yet.  But, I don't want it to get lost in the 
shuffle, so I propose to do so in a few days if I don't hear any 
objection or request for more time to review it meanwhile.

-Sandra


2015-01-08  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi ([-fvtable-verify]): Copy-edit and fix markup.
	([-fvtv-debug], [-fvtv-counts]): Likewise.  Correct location
	of log files.
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