Finish minor changes seen from DVI output.

Finish minor changes seen from DVI output.
Replace 22.1.100 with 22.1.1.
(current-kill): Mention functions that directly or indirectly call
`kill-new', which sets `kill-ring-yank-pointer'.
(Understanding current-kill): Change `lasted' to `last'.  Remove
extraneous parenthesis.  Reword item about returning `car' of list.
(yank): Remove mention of `rotate-yank-pointer'.
(Y Axis Element): Add comment regarding replacement of blank space.
(print-Y-axis Penultimate): Explain that `print-graph' will pass
`height-of-top-line' so `print-Y-axis' does not have a bug.