added missing links (#1295)

* added missing links

* changed links to absolutely links

Thanks @mairaw

* fixed api links

Author: Pacort

docs/fsharp/language-reference/query-expressions.md

@@ -47,7 +47,7 @@ query1
 |> Seq.iter (fun customer -> printfn "Company: %s Contact: %s" customer.CompanyName customer.ContactName)
 ```
 
-In the previous code example, the query expression is in curly braces. The meaning of the code in the expression is, return every customer in the Customers table in the database in the query results. Query expressions return a type that implements `System.Linq.IQueryable`1` and `System.Collections.Generic.IEnumerable`1`, and so they can be iterated using the [Seq module](https://msdn.microsoft.com/library/54e8f059-ca52-4632-9ae9-49685ee9b684) as the example shows.
+In the previous code example, the query expression is in curly braces. The meaning of the code in the expression is, return every customer in the Customers table in the database in the query results. Query expressions return a type that implements @System.Linq.IQueryable%601 and @System.Collections.Generic.IEnumerable%601, and so they can be iterated using the [Seq module](https://msdn.microsoft.com/library/54e8f059-ca52-4632-9ae9-49685ee9b684) as the example shows.
 
 Every computation expression type is built from a builder class. The builder class for the query computation expression is `QueryBuilder`. For more information, see [Computation Expressions](computation-expressions.md) and [Linq.QueryBuilder Class](https://msdn.microsoft.com/visualfsharpdocs/conceptual/linq.querybuilder-class-%5bfsharp%5d).