remove unneeded ( from README (graphql#1666)

Author: dimaMachina

Diff for: README.md

@@ -20,9 +20,9 @@ The site is deployed via Vercel on merges to the `source` branch.
 
 ## How to contribute
 
-Check out our [contributing guide](./CONTRIBUTING.md) for detailed instructions on how to make changes to the GraphQL website 🎉
+Check out our [contributing guide](./CONTRIBUTING.md) for detailed instructions on how to make changes to the GraphQL website 🎉.
 
-This repository is managed by EasyCLA. Project participants must sign the free ([GraphQL Specification Membership agreement](https://preview-spec-membership.graphql.org) before making a contribution. You only need to do this one time, and it can be signed by [individual contributors](http://individual-spec-membership.graphql.org/) or their [employers](http://corporate-spec-membership.graphql.org/).
+This repository is managed by EasyCLA. Project participants must sign the free [GraphQL Specification Membership agreement](https://preview-spec-membership.graphql.org) before making a contribution. You only need to do this one time, and it can be signed by [individual contributors](http://individual-spec-membership.graphql.org/) or their [employers](http://corporate-spec-membership.graphql.org/).
 
 To initiate the signature process please open a PR against this repo. The EasyCLA bot will block the merge if we still need a membership agreement from you.