[doc, committed] preprocessor documentation cleanup, part 3/n

[Sandra Loosemore]

This patch takes care of a leftover from the last installment of this 
series -- I'd missed that there was a duplicate entry for -x in 
cppopts.texi.  I've also moved -fno-show-column out of the preprocessor 
options and into the "Diagnostic Message Formatting Options" section, 
where people will be more likely to find it.

More shuffling around and refactoring of include files coming in the 
next installment.

-Sandra

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