Fix typo

Author: arnaudgeiser

src/manifold/executor.clj

@@ -36,7 +36,7 @@
   "Create a new `java.lang.Thread`.
 
   It represents the default implementation on `thread-factory` when the
-  `new-thread-fn` argument is no passed."
+  `new-thread-fn` argument is not passed."
   [group target name stack-size]
   (Thread. group target name stack-size))