Fix documentation for the list available assignees endpoint (#227)

docs/src/main/tut/issue.md

@@ -340,7 +340,7 @@ You can list available assignees for issues in repo with the following parameter
  To list available assignees:
 
 ```tut:silent
-val assignees = Github(accessToken).issues.listAvailableAssignees("47deg", "github4s", 123)
+val assignees = Github(accessToken).issues.listAvailableAssignees("47deg", "github4s")
 assignees.exec[cats.Id, HttpResponse[String]]() match {
   case Left(e) => println(s"Something went wrong: ${e.getMessage}")
   case Right(r) => println(r.result)
@@ -356,4 +356,4 @@ As you can see, a few features of the issue endpoint are missing.
 As a result, if you'd like to see a feature supported, feel free to create an issue and/or a pull request!
 
 [issue-scala]: https://github.com/47deg/github4s/blob/master/github4s/shared/src/main/scala/github4s/free/domain/Issue.scala
-[user-scala]: https://github.com/47deg/github4s/blob/master/github4s/shared/src/main/scala/github4s/free/domain/User.scala
+[user-scala]: https://github.com/47deg/github4s/blob/master/github4s/shared/src/main/scala/github4s/free/domain/User.scala