Update README.md

Author: h908714124

README.md

@@ -26,7 +26,7 @@ Either<String, BigInteger> possiblyPrime = Stream.generate(() ->
         .orElseGet(() -> Either.left("no such value"));
 ````
 
-Declaring the result type before the `map` operation is necessary, due to limitations of Java's typechecker.
+Repeating the result type in the `map` operation is necessary, due to a limitation of Java's typechecker.
 
 ### Working with Either