Corrected cross references to AoE

Some of the cross-reference errors are systematic: many need an increment in the last place: for example, “sec. 2.3.3” should be “sec. 2.3.4.”  But not all are as simple as that.

Note: You can sort by page or by date, and you can download a pdf. Errata are corrected in successive printings, with approximate cutoff dates where applicable; so you can scroll down a date-sorted list to find needed corrections.