xf86-video-savage: Document existence of IgnoreEDID option

[Alex Villací­s Lasso]

This flag was added by me in a patch, but forgot to update the man page. 
This patch adds such update.

Changelog:
Document existence of IgnoreEDID option.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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