[llvm] [LangRef] Rename 'operand' to 'argument' in descriptions of VP intrinsics. NFC (PR #97437)

[Fraser Cormack via llvm-commits]

================
@@ -20471,16 +20474,16 @@ Predicated computation of the unsigned remainder of two integer vectors.
 Arguments:
 """"""""""
 
-The first two operands and the result have the same vector of integer type. The
-third operand is the vector mask and has the same number of elements as the
-result vector type. The fourth operand is the explicit vector length of the
+The first two arguments and the result have the same vector of integer type. The
+third argument is the vector mask and has the same number of elements as the
+result vector type. The fourth argument is the explicit vector length of the
 operation.
 
 Semantics:
 """"""""""
 
 The '``llvm.vp.urem``' intrinsic computes the remainder of the unsigned division
-(:ref:`urem <i_urem>`) of the first and second vector operand on each enabled
+(:ref:`urem <i_urem>`) of the first and second vector argument on each enabled
----------------
frasercrmck wrote:

sorry, just spotted another: `first and second vector arguments`.

https://github.com/llvm/llvm-project/pull/97437