Fix a mistake in an HTML example code snippet.

Caught by Kurt Arnlund!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163286 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ObjectiveCLiterals.html

@@ -178,7 +178,7 @@ A C string literal prefixed by the <code>'@'</code> token denotes an <code>NSStr
 <pre>
 // Partition command line arguments into positional and option arguments.
 NSMutableArray *args = [NSMutableArray new];
-NSMutableDictionary *options = [NSMutableArray new];
+NSMutableDictionary *options = [NSMutableDictionary new];
 while (--argc) {
     const char *arg = *++argv;
     if (strncmp(arg, "--", 2) == 0) {