delete comparison.md because tooltips do not work on github

Author: samuelgruetter

language-adaptors/rxjava-scala/TODO.md

@@ -9,7 +9,7 @@ This is a (probably incomplete) list of what still needs to be done in the Scala
 *    Notification as a case class
 *    integrating Scala Futures, should there be a common base interface for Futures and Observables?
 *    Add methods present in Scala collections library, but not in RxJava, e.g. aggregate à la Scala, collect, exists, tails, ...
-*    combineLatest with about arities > 2
+*    combineLatest with arities > 2
 *    decide where the MovieLib/MovieLibUsage (use Scala code from Java code) example should live and make sure gradle builds it in the right order
 *    Avoid text duplication in scaladoc using templates, add examples, distinction between use case signature and full signature
 *    other small TODOs