[w3c/manifest] Reference to BIDI should probably use SpecRef reference to UAX9 (editorial) (Issue #1081)

`dir` member
https://w3c.github.io/manifest/#dir-member

> If the [base direction](https://w3c.github.io/manifest/#dfn-base-direction) is [ltr](https://w3c.github.io/manifest/#dfn-ltr) or [rtl](https://w3c.github.io/manifest/#dfn-rtl), override [Rule P3](https://www.unicode.org/reports/tr9/tr9-46.html#P3) of [[BIDI](https://w3c.github.io/manifest/#bib-bidi)], setting the paragraph embedding level to 0 if the [base direction](https://w3c.github.io/manifest/#dfn-base-direction) is [ltr](https://w3c.github.io/manifest/#dfn-ltr), or 1 if the [base direction](https://w3c.github.io/manifest/#dfn-base-direction) is [rtl](https://w3c.github.io/manifest/#dfn-rtl).

The reference to BIDI should probably use the canned definition for UAX9 instead of defining a separate locally maintained copy.

The I18N WG notes that specifying the aspects of UBA here seems like overkill: you are transmitting metadata. It is up to implementations to use direction metadata appropriately.

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