emcc --help fix

emcc

@@ -126,7 +126,7 @@ Options that are modified or new in %s include:
   --typed-arrays <mode>    0: No typed arrays
                            1: Parallel typed arrays
                            2: Shared (C-like) typed arrays (default)
-  --llvm-opts <level>      0: No LLVM optimizations
+  --llvm-opts <level>      0: No LLVM optimizations (default)
                            1: Safe/portable LLVM optimizations
                            2: Full, unsafe/unportable LLVM optimizations;
                               this will almost certainly break the