vec_bperm description is wrong in several ways #47

As described in #14:

For vbpermq, instead of "bit i of r", the third bullet should say "bit 48+i of r". That leaves bits 0:47 and 64:127 as 0, as they should be.

For vbpermd, the first subbullet should replace "jth element of b" with "(i*8+j)th element of b." The second and third subbullets should replace "bit j" with "bit 56+j". That leaves bits 0:55 and 64:119 as 0, as they should be.

That should follow the ISA correctly.

As described in #14: For vbpermq, instead of "bit i of r", the third bullet should say "bit 48+i of r". That leaves bits 0:47 and 64:127 as 0, as they should be. For vbpermd, the first subbullet should replace "jth element of b" with "(i*8+j)th element of b." The second and third subbullets should replace "bit j" with "bit 56+j". That leaves bits 0:55 and 64:119 as 0, as they should be. That should follow the ISA correctly.

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vec_bperm description is wrong in several ways #47