[w3c/webcomponents] Add a missing parenthesis (#698)

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

  https://github.com/w3c/webcomponents/pull/698

-- Commit Summary --

  * Add a missing parenthesis

-- File Changes --

    M proposals/Template-Instantiation.md (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/698.patch
https://github.com/w3c/webcomponents/pull/698.diff

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