docs: restore LF line endings, correct the diamond-exit pitfall

The three edited references arrived as CRLF, so GitHub showed a 459/413
whole-file rewrite where the real change is 46 added lines. Restore LF and
leave the added sections untouched.

Also correct the first decision-diamond row: the inward first segment that
crosses the rhombus's own interior reproduces with the pin on the shape's
left/right side (`exitX=0;exitY=0.25`, target at the same height). At the
exact vertex (`exitY=0.5`) the router detours around the whole shape instead.
Both read wrong, and the documented fix (straight lines from the lower edge
midpoints) is unchanged.