Update exception-unions to be consistent.

Author: Crell

spec.md

@@ -1052,7 +1052,7 @@ try {
     // ...
 } catch (FirstThrowableType $e) {
     // ...
-} catch (OtherThrowableType | AnotherThrowableType $e) {
+} catch (OtherThrowableType|AnotherThrowableType $e) {
     // ...
 } finally {
     // ...