[S03] Remove extraneous commas from operator precedence table

Wouldn't want people thinking those commas are part of the example
operators, now would we?

Author: ShimmerFairy

S03-operators.pod

@@ -54,8 +54,8 @@ each level:
     R  List prefix       print push say die map substr ... [+] [*] any Z=
     X  Loose and         and andthen
     X  Loose or          or xor orelse
-    X  Sequencer         <==, ==>, <<==, ==>>
-    N  Terminator        ; {...}, unless, extra ), ], }
+    X  Sequencer         <== ==> <<== ==>>
+    N  Terminator        ; {...} unless extra ) ] }
 
 Using two C<!> symbols below generically to represent any pair of operators
 that have the same precedence, the associativities specified above