MODKEY bit description is wrong

[Pimau]

Describe where we can find the problematic topic
APPENDIX D: The MEGA65 Keyboard
USING THE TYPING EVENT QUEUE
Page D-4
The little table showing the modifier keys bits in MODKEY

Describe the solution you'd like
(I have no MEGA65 machine ... maybe it is a XEMU not a documentation bug?)
The documentation says bit 0 is right shift and bit 1 is left shift. It should be the other way around.
I get 1 for left shift, 2 for right shift and 3 for both shifts ... on my Xemu.

Tested with reading the immediate modifier keys from $D611..

[dansanderson]

Nice catch! Fixed here: 77c8ea1

Register auto-doc fix is here, will need to be merged by the core team before it shows up in docs: MEGA65/mega65-core#743