Fix select examples in spec

Author: joefreeman

docs/spec.md

@@ -486,13 +486,13 @@ For example, given two processes, `p1` and `p2`, the following select will wait
 
 ```
 // Wait for
-!(p1 | p2 | 5000)
+!(p1, p2, 5000)
 ```
 
 A select operator can be used in a chain by including the ripple operator (`~`) to refer to the chained value. For example, to wait for a process, but timeout after one second:
 
 ```
-p1 ~> !(~ | 1000)
+p1 ~> !(~, 1000)
 ```
 
 ### Referring to processes