message: Fix DialNumber description in HMI API
diff: <function name="DialNumber" messagetype="request">
  <description>Request from SDL to call a specific number.</description>
  <param name="number" type="String" maxlength="40" mandatory="true">
  - <description>The number to dial. Only the character + and numbers are allowed.</description>
  + <description>
  + Phone number is a string, which can be up to 40 chars.
  + All characters shall be stripped from string except digits 0-9 and * # , ; +
  + </description>
  </param>
  <param name="appID" type="Integer" mandatory="true">
  <description>ID of application that concerns this RPC.</description>
  