[RISCV][NFC] Fix typo: "wererenamed" to "were renamed" (#104530)

This commit corrects a typo in a comment from "wererenamed" to "were
renamed". No functional changes.

Author: nosba0957

llvm/lib/Target/RISCV/RISCVInstrInfo.td

@@ -1056,7 +1056,7 @@ def : InstAlias<"sltu $rd, $rs1, $imm12",
 
 def : MnemonicAlias<"move", "mv">;
 
-// The SCALL and SBREAK instructions wererenamed to ECALL and EBREAK in
+// The SCALL and SBREAK instructions were renamed to ECALL and EBREAK in
 // version 2.1 of the user-level ISA. Like the GNU toolchain, we still accept
 // the old name for backwards compatibility.
 def : MnemonicAlias<"scall", "ecall">;