[w3c/manifest] Value `auto` for `dir` probably shouldn't say "no explicit directionality" (Issue #1079)

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

> "auto" (default)
>    No explicit directionality. 

The value `auto` isn't exactly the same as "no explicit directionality". It means that the direction of strings with this value should be estimated using the first-strong part of the bidi algorithm. It is an explicit value. It also implies that the value should be bidi isolated when displayed. Perhaps say "Direction determined from content" instead?

Note that content which fools the "first-strong" detection in `auto` is common: an actual direction value such as `rtl` or `ltr` is preferred to just relying on `auto`.

Note that there was some previous discussion of this topic in https://github.com/w3c/manifest/pull/926

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