LoongArch: extend.texi: Fix typos in LSX intrinsics

LoongArch: extend.texi: Fix typos in LSX intrinsics

Several typos have been found and fixed: missing semicolons, using
variable name instead of type, duplicate functions and wrong types.

gcc/ChangeLog:

	* doc/extend.texi(__lsx_vabsd_di): remove extra `i' in name.
	(__lsx_vfrintrm_d, __lsx_vfrintrm_s, __lsx_vfrintrne_d,
	__lsx_vfrintrne_s, __lsx_vfrintrp_d, __lsx_vfrintrp_s, __lsx_vfrintrz_d,
	__lsx_vfrintrz_s): fix return types.
	(__lsx_vld, __lsx_vldi, __lsx_vldrepl_b, __lsx_vldrepl_d,
	__lsx_vldrepl_h, __lsx_vldrepl_w, __lsx_vmaxi_b, __lsx_vmaxi_d,
	__lsx_vmaxi_h, __lsx_vmaxi_w, __lsx_vmini_b, __lsx_vmini_d,
	__lsx_vmini_h, __lsx_vmini_w, __lsx_vsrani_d_q, __lsx_vsrarni_d_q,
	__lsx_vsrlni_d_q, __lsx_vsrlrni_d_q, __lsx_vssrani_d_q,
	__lsx_vssrarni_d_q, __lsx_vssrarni_du_q, __lsx_vssrlni_d_q,
	__lsx_vssrlrni_du_q, __lsx_vst, __lsx_vstx, __lsx_vssrani_du_q,
	__lsx_vssrlni_du_q, __lsx_vssrlrni_d_q): add missing semicolon.
	(__lsx_vpickve2gr_bu, __lsx_vpickve2gr_hu): fix typo in return
	type.
	(__lsx_vstelm_b, __lsx_vstelm_d, __lsx_vstelm_h,
	__lsx_vstelm_w): use imm type for the last argument.
	(__lsx_vsigncov_b, __lsx_vsigncov_h, __lsx_vsigncov_w,
	__lsx_vsigncov_d): remove duplicate definitions.