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[clang][docs] Revise documentation for __builtin_reduce_(max|min). (#114637)

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The function operation described in the document did not match its
actual semantic meaning, this patch resolved the problem.
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clang/docs/LanguageExtensions.rst
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@ -745,12 +745,10 @@ Let ``VT`` be a vector type and ``ET`` the element type of ``VT``.
======================================= ====================================================================== ==================================
Name Operation Supported element types
======================================= ====================================================================== ==================================
ET __builtin_reduce_max(VT a) return x or y, whichever is larger; If exactly one argument is integer and floating point types
a NaN, return the other argument. If both arguments are NaNs,
fmax() return a NaN.
ET __builtin_reduce_min(VT a) return x or y, whichever is smaller; If exactly one argument integer and floating point types
is a NaN, return the other argument. If both arguments are
NaNs, fmax() return a NaN.
ET __builtin_reduce_max(VT a) return the largest element of the vector. The floating point result integer and floating point types
will always be a number unless all elements of the vector are NaN.
ET __builtin_reduce_min(VT a) return the smallest element of the vector. The floating point result integer and floating point types
will always be a number unless all elements of the vector are NaN.
ET __builtin_reduce_add(VT a) \+ integer types
ET __builtin_reduce_mul(VT a) \* integer types
ET __builtin_reduce_and(VT a) & integer types