Update CORE-V Bit Manipulation Operand Order in corev-builtin-spec.md
Created by: NandniJamnadas
Updated operand order for instructions cv.bclr, cv.bset, cv.extract,
cv.extractu, cv.insert from rd,rs1,Is2,Is3 to rd,rs1,Is3,Is2.
Updated history table to reflect this patch.
* specifications/corev-builtin-spec.md: Modified.