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

[Fraser Cormack via llvm-commits]

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@@ -24888,16 +24891,16 @@ Predicated fshr of three vectors of integers.
 Arguments:
 """"""""""
 
-The first three operand and the result have the same vector of integer type. The
-fourth operand is the vector mask and has the same number of elements as the
-result vector type. The fifth operand is the explicit vector length of the
+The first three argument and the result have the same vector of integer type. The
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frasercrmck wrote:

typo (inherited from the original): `arguments`. There's a few other places where this occurs.

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