Fixed a typo in Control docs.

doc/Control

@@ -118,7 +118,7 @@ fanin : [ a_1 |->| b, a_2, |->| b, ..., a_n |->| b ]
 fanin = cases, since '+' is simple union.
 
 fastest : |<a>| * |<b>| -> |< a+b >|
-fastest : [ |<a_1>|, |<a_2>|, ..., |<a_n>| ] -> |< a_1|a_2+...+a_n >|
+fastest : [ |<a_1>|, |<a_2>|, ..., |<a_n>| ] -> |< a_1+a_2+...+a_n >|
 
 slowest : |<a>| * |<b>| -> |< a+b >|
 slowest : [ |<a_1>|, |<a_2>|, ..., |<a_n>| ] -> |< a_1+a_2+...+a_n >|