Update kbn.js

data rate for Mbits has typo - should be megabits/sec - not megabites/sec

public/app/core/utils/kbn.js

@@ -595,7 +595,7 @@ function($, _) {
           {text: 'bytes/sec',   value: 'Bps'},
           {text: 'kilobites/sec', value: 'Kbits'},
           {text: 'kilobytes/sec',    value: 'KBs'},
-          {text: 'megabites/sec', value: 'Mbits'},
+          {text: 'megabits/sec', value: 'Mbits'},
           {text: 'megabytes/sec',    value: 'MBs'},
           {text: 'gigabytes/sec',   value: 'GBs'},
           {text: 'gigabites/sec',   value: 'Gbits'},