[patch, fortran, docs] invoke.texi: Document Wcharacter-truncation, misc. edits.

[Brooks Moses]

This is the same as the patch I just committed to 4.2, except it also 
adds documentation for -fintrinsic-modules-path.

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2007-03-23  Brooks Moses  <brooks.moses@codesourcery.com>

	* invoke.texi: Misc. small typo fixes.
	(-Wcharacter-truncation): Add.
	(-Wnonstd-intrinsics): Correct spelling.
	(-std=): Edit.
	(-fintrinsic-modules-path): Add.

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Tested on i686-pc-linux-gnu with "make pdf" and "make info", and committed.

- Brooks
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