example(index.jade): Fixed mac-autocomplete example

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src/index.jade

@@ -167,7 +167,7 @@ block append content
           = '  mac-autocomplete-url="autocompleteUrl"\n'
           = '  mac-autocomplete-query="q"\n'
           = '  mac-autocomplete-on-success="onSuccess(data)"\n'
-          = '  mac-autocomplete-placeholder="\'Autocomplete\'">\n'
+          = '  mac-placeholder="\'Autocomplete\'">\n'
           = '</mac-autocomplete>\n'
 
         h3 Example with autocomplete using source