Remove comments before <span>s

[rsandifo-arm]

ACLE had developed a style of prefixing empty s with:

However, this appears to confuse the GitHub renderer when used in bullet points. It was skipping large portions of text after the streaming-intrinsic and vl-dependent anchors, and formatting later text as though it was part of the same bullet point.

Also, I think these large comments make it harder to see the itself. Probably because of this,

16-bit-floating-point-data-processing-operations

had become unmoored from the associated text.

This patch removes the comments (which seems to fix the rendering) and moves 16-bit-floating-point-data-processing-operations to the appropriate place. I checked each anchor manually to make sure that it still worked.

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[sdesmalen-arm]

This change looks fine to me, thanks for fixing this!

[sallyarmneale]

LGTM