[heycam/webidl] ObservableArray type should only be allowed on interface (#1001)

Closes #1000.


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### :boom: Error: 500 Internal Server Error :boom: ###

[PR Preview](https://github.com/tobie/pr-preview#pr-preview) failed to build. _(Last tried on Jul 29, 2021, 12:23 PM UTC)_.

<details>
<summary>More</summary>


PR Preview relies on a number of web services to run. There seems to be an issue with the following one:

:rotating_light: [CSS Spec Preprocessor](https://api.csswg.org/bikeshed/) - CSS Spec Preprocessor is the web service used to build Bikeshed specs.

:link: [Related URL](https://api.csswg.org/bikeshed/?url=https%3A%2F%2Fraw.githubusercontent.com%2Fheycam%2Fwebidl%2F008d7cb6b579aff1f4663677d744fdb3cb4687f3%2Findex.bs&md-warning=not%20ready)

```
<html><body><p><strong>WARNING: </strong>mysqli_connect(): (HY000/2002): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)</p></body></html>
```

_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](https://github.com/tobie/pr-preview/issues/new?title=Error%20not%20surfaced%20properly&body=See%20heycam/webidl%231001.)._
</details>

You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/1001

-- Commit Summary --

  * ObservableArray type should only be allowed on interface

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/1001.patch
https://github.com/heycam/webidl/pull/1001.diff

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Received on Thursday, 29 July 2021 12:23:31 UTC