RFR: JDK-8276800 Fix table headers in NumericShaper.html [v3]

[Ludvig Janiuk]

On Wed, 10 Nov 2021 10:58:08 GMT, Ludvig Janiuk <duke at openjdk.java.net> wrote:

>> This change introduces no visual difference, but improves a11y.
>
> Ludvig Janiuk has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Most idiomatic version so far

Ah, I see. In that case, I'll be reintroducing the two tbodies, and removing the ids I forgot to remove.

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PR: https://git.openjdk.java.net/jdk/pull/6291