[Doc] Fix Usage example table and closed issues link

Author: slax57

.github/CONTRIBUTING.md

@@ -14,7 +14,7 @@ Here, indicate the best way to ask questions: via a github issue.
 
 ## Opening an Issue
 
-If you think you have found a bug, or have a new feature idea, please start by making sure it hasn't already been [reported or fixed](https//github.com/marmelab/json-graphql-server/issues?q=is%3Aissue+is%3Aclosed). You can search through existing issues and PRs to see if someone has reported one similar to yours.
+If you think you have found a bug, or have a new feature idea, please start by making sure it hasn't already been [reported or fixed](https://github.com/marmelab/json-graphql-server/issues?q=is%3Aissue+is%3Aclosed). You can search through existing issues and PRs to see if someone has reported one similar to yours.
 
 Next, create a new issue that briefly explains the problem, and provides a bit of background as to the circumstances that triggered it, and steps to reproduce it.
 

README.md

@@ -396,7 +396,6 @@ Here is how you can use the queries and mutations generated for your data, using
             </pre>
         </td>
     </tr>
-
     <tr>
         <td>
             <pre>