[w3c/webcomponents] Replace Em dash with hyphen minus (#696)

This can be hard to find the difference on markdown...

![screen shot 2017-11-05 at 0 56 08](https://user-images.githubusercontent.com/250407/32406945-3f7a63d2-c1c4-11e7-9244-545d6d88467c.png)

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

  https://github.com/w3c/webcomponents/pull/696

-- Commit Summary --

  * Replace Em dash with hyphen minus

-- File Changes --

    M proposals/Template-Instantiation.md (2)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/696.patch
https://github.com/w3c/webcomponents/pull/696.diff

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