Range: wrap reference table to prevent Safari overflow

[davidizzle]

Reference issue: #75112 (on golang/go not golang/wiki)
golang/go#75112

The problem is the MarkDown table overflows from mobile on Safari.
The easy fix is to wrap it in an HTML div that enables horizontal scroll. This could be propagated to any and all table on the go/wiki website, but for now this is the minimal, straightforward fix to close this issue.

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