minor comment issue

[flowchartsman]

Was browsing the source and found a comment that seems to be cut off. Minor issue, but the explanation is incomplete.

simdjson-go/stage2_build_tape_amd64.go

Line 93 in 9743702

// Make sure we account for at least 32 bytes additional space due to

[klauspost]

@flowchartsman I believe this is to allow for over-reading input.