Reference detailed selectivity options in table

[kellijohnson-NOAA]

https://github.com/nmfs-stock-synthesis/doc/blob/3ca597487102c675482389594824e3dcdfbb9967/9control.tex#L1628-L1684

It would be really neat if we could hyperlink patterns in the table to detailed sections about each pattern. Not necessary but something that I found myself thinking about when I was too lazy to scroll. Thanks for making the manual great and something that I look at all of the time.

[Rick-Methot-NOAA]

I've always dreamed of having hyperlinks among SSI, manual, technical doc, code.