Fix #111 sm4ed/ks mentions rt instead of rs1

 On branch dev/next-release
 Your branch is ahead of 'origin/dev/next-release' by 1 commit.
   (use "git push" to publish your local commits)

 Changes to be committed:
	modified:   insns/sm4ed.adoc
	modified:   insns/sm4ks.adoc

 Changes not staged for commit:
	modified:   ../../extern/riscv-gnu-toolchain (modified content)
	modified:   ../../extern/sail-riscv (untracked content)

doc/scalar/insns/sm4ed.adoc

@@ -27,7 +27,7 @@ Implements a T-tables in hardware style approach to accelerating the
 SM4 round function.
 A byte is extracted from `rs2` based on `bs`, to which the SBox and
 linear layer transforms are applied, before the result is XOR'd with
-`rt` and written back to `rd`.
+`rs1` and written back to `rd`.
 This instruction exists on RV32 and RV64 base architectures.
 On RV64, the 32-bit result is sign extended upto XLEN bits.
 This instruction must _always_ be implemented such that it's execution

doc/scalar/insns/sm4ks.adoc

@@ -27,7 +27,7 @@ Implements a T-tables in hardware style approach to accelerating the
 SM4 Key Schedule.
 A byte is extracted from `rs2` based on `bs`, to which the SBox and
 linear layer transforms are applied, before the result is XOR'd with
-`rt` and written back to `rd`.
+`rs1` and written back to `rd`.
 This instruction exists on RV32 and RV64 base architectures.
 On RV64, the 32-bit result is sign extended upto XLEN bits.
 This instruction must _always_ be implemented such that it's execution