[heycam/webidl] Add [AllowShared] in the list of applicable-to-types (#695)

Annotated types lists 3 extended attributes as applicable-to-type attributes, and [AllowShared] is not in the list.
On the other hand, [AllowShared] is explained to appear on one of the buffer source type, and it means [AllowShared] is applicable to types.

This PR adds [AllowShared] in the list of applicable to types extended attributes, so that it fixes the ambiguity.

ISSUE=#687
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/695

-- Commit Summary --

  * Add [AllowShared] in the list of applicable-to-types

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/heycam/webidl/pull/695.patch
https://github.com/heycam/webidl/pull/695.diff

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