1. Updated section "Instruction Set Summary" with new instructions: LAC, LAS, LAT, and XCH.
Section "LAC - Load and Clear"
Section "LAS – Load and Set"
Section "LAT – Load and Toggle"
Section "XCH – Exchange"
2. Updated number of clock cycles column to include Reduced Core tinyAVR.
(ATtiny replaced by Reduced Core tinyAVR).