[webcomponents] spec/custom/index.html: Fix "suports" [sic] typo (#278)

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

  https://github.com/w3c/webcomponents/pull/278

-- Commit Summary --

  * spec/custom/index.html: Fix "suports" [sic] typo

-- File Changes --

    M spec/custom/index.html (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/278.patch
https://github.com/w3c/webcomponents/pull/278.diff

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https://github.com/w3c/webcomponents/pull/278