doc: grammar fix

Alfie John · Alfie John · commit b9c3b5693ad5 · 2014-12-09T20:17:40.000Z
diff --git a/src/doc/reference.md b/src/doc/reference.md
@@ -3141,8 +3141,8 @@ as
 ```
 
 Operators at the same precedence level are evaluated left-to-right. [Unary
-operators](#unary-operator-expressions) have the same precedence level and it
-is stronger than any of the binary operators'.
+operators](#unary-operator-expressions) have the same precedence level and are
+stronger than any of the binary operators.
 
 ### Grouped expressions
 
