[heycam/webidl] Adjust wording in the legacy callers section. (#289)

Say "interfaces that also support", not "interfaces that also supports".
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/289

-- Commit Summary --

  * Adjust wording in the legacy callers section.

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/289.patch
https://github.com/heycam/webidl/pull/289.diff

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