Fix precedence table in reference

ubsan · ubsan · commit 76babf9c8ee4 · 2016-08-04T13:28:24.000-07:00
diff --git a/src/doc/reference.md b/src/doc/reference.md
@@ -3049,7 +3049,8 @@ as
 == != < > <= >=
 &&
 ||
-= ..
+.. ...
+=
 ```
 
 Operators at the same precedence level are evaluated left-to-right. [Unary
