Wrong instruction names for v128.loadX_splat in instruction index

[ictrobot]

The instruction index is missing the 8/16/32/64 suffixes for the v128.load_splat instructions:

spec/document/core/appendix/index-instructions.rst

Lines 289 to 292 in 6e1efd1

	:math:`\V128.\LOAD\K{\_splat}~\memarg` :math:`\hex{FD}~~\hex{07}` :math:`[\I32] \to [\V128]` :ref:`validation <valid-load-splat>` :ref:`execution <exec-load-splat>`
	:math:`\V128.\LOAD\K{\_splat}~\memarg` :math:`\hex{FD}~~\hex{08}` :math:`[\I32] \to [\V128]` :ref:`validation <valid-load-splat>` :ref:`execution <exec-load-splat>`
	:math:`\V128.\LOAD\K{\_splat}~\memarg` :math:`\hex{FD}~~\hex{09}` :math:`[\I32] \to [\V128]` :ref:`validation <valid-load-splat>` :ref:`execution <exec-load-splat>`
	:math:`\V128.\LOAD\K{\_splat}~\memarg` :math:`\hex{FD}~~\hex{0A}` :math:`[\I32] \to [\V128]` :ref:`validation <valid-load-splat>` :ref:`execution <exec-load-splat>`

spec/document/core/binary/instructions.rst

Lines 491 to 494 in 6e1efd1

	\hex{FD}~~7{:}\Bu32~~m{:}\Bmemarg &\Rightarrow& \V128.\LOAD\K{8\_splat}~m \\ &&|&
	\hex{FD}~~8{:}\Bu32~~m{:}\Bmemarg &\Rightarrow& \V128.\LOAD\K{16\_splat}~m \\ &&|&
	\hex{FD}~~9{:}\Bu32~~m{:}\Bmemarg &\Rightarrow& \V128.\LOAD\K{32\_splat}~m \\ &&|&
	\hex{FD}~~10{:}\Bu32~~m{:}\Bmemarg &\Rightarrow& \V128.\LOAD\K{64\_splat}~m \\ &&|&