chore(Docs): Update graph-links.md to remove a duplicate word

wiki/content/graphql/schema/graph-links.md

@@ -48,7 +48,7 @@ type Post {
 }
 ```
 
-Then, the schema says that an author has a list of posts and a post has an author.  But, that GraphQL schema doesn't doesn't say that every post in the list of posts for an author has the same author as their `author`.  For example, it's perfectly valid for author `a1` to have a `posts` edge to post `p1`, that has an `author` edge to author `a2`.  Here, we'd expect an author to be the author of all their posts, but that's not what GraphQL enforces.  In GraphQL, it's left up to the implementation to make two-way connections in cases that make sense.  That's just part of how GraphQL works.
+Then, the schema says that an author has a list of posts and a post has an author.  But, that GraphQL schema doesn't say that every post in the list of posts for an author has the same author as their `author`.  For example, it's perfectly valid for author `a1` to have a `posts` edge to post `p1`, that has an `author` edge to author `a2`.  Here, we'd expect an author to be the author of all their posts, but that's not what GraphQL enforces.  In GraphQL, it's left up to the implementation to make two-way connections in cases that make sense.  That's just part of how GraphQL works.
 
 In Dgraph, the directive `@hasInverse` is used to create a two-way edge.  
 
@@ -123,4 +123,4 @@ type Post {
 }
 ```
 
-Now, Dgraph will manage the connection between posts and authors and you can get on with concentrating on what your app needs to to - suggesting them interesting content.
+Now, Dgraph will manage the connection between posts and authors and you can get on with concentrating on what your app needs to to - suggesting them interesting content.