Fix bug

Author: b-studios

examples/tour/captures.effekt.md

@@ -83,7 +83,7 @@ Thus, we need to enforce that both `f` and `g` are pure, that is, do not capture
 ```
 def parallel (f: () => Unit at {}, g: () => Unit at {}): Unit = <>
 ```
-The type-checker will reject calls, where we try to pass functions that to close over capabilities (or builtin resources):
+The type-checker will reject calls, where we try to pass functions that close over capabilities (or builtin resources):
 ```effekt:repl
 parallel(
   box { () => println("Hello, ") },