[Local] Update documentation to reflect reality. NFCI.

Author: Davide Italiano

include/swift/SILOptimizer/Utils/Local.h

@@ -56,7 +56,7 @@ NullablePtr<SILInstruction> createDecrementBefore(SILValue Ptr,
 /// \brief For each of the given instructions, if they are dead delete them
 /// along with their dead operands.
 ///
-/// \param I The instruction to be deleted.
+/// \param I The ArrayRef of instructions to be deleted.
 /// \param Force If Force is set, don't check if the top level instructions
 ///        are considered dead - delete them regardless.
 /// \param C a callback called whenever an instruction is deleted.