Add note about option-like arguments to alter filter

The Yargs parser doesn't seem to play nicely with option-like arguments
that are passed as positional arguments. For more information, refer to
the following issues:

  yargs/yargs-parser#381
  yargs/yargs-parser#145
  yargs/yargs#1821

maxctrl/lib/alter.js

@@ -174,7 +174,11 @@ exports.builder = function (yargs) {
             "To display the filter parameters, execute `show filter <filter>`. " +
               "Some filters support runtime configuration changes to all parameters. " +
               "Refer to the filter documentation for details on whether it supports " +
-              "runtime configuration changes and which parameters can be altered."
+              "runtime configuration changes and which parameters can be altered.\n" +
+              "\n" +
+              "Note: To pass options with dashes in them, surround them in both single and double quotes: \n" +
+              "\n" +
+              "      maxctrl alter filter my-namedserverfilter target01 '\"->master\"'"
           )
           .usage("Usage: alter filter <filter> <key> <value> ...");
       },