Update README.md
Remove typo and make buildpack scope description more generic
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-A Cloud Foundry [buildpack](http://docs.cloudfoundry.org/buildpacks/) for static stites (HTML/JS/CSS).
+A Cloud Foundry [buildpack](http://docs.cloudfoundry.org/buildpacks/) for static content such as websites (HTML/JS/CSS).
### Buildpack User Documentation
