docs: fix default value for sshauth option of libssh2/libssh

Both transports include "password" in their default authentication
methods.

docs/remote.html.in

@@ -400,8 +400,8 @@ Note that parameter values must be
         <td> libssh2, libssh </td>
         <td>
   A comma separated list of authentication methods to use. Default (is
-  "agent,privkey,keyboard-interactive". The order of the methods is preserved.
-  Some methods may require additional parameters.
+  "agent,privkey,password,keyboard-interactive". The order of the methods
+  is preserved. Some methods may require additional parameters.
 </td>
       </tr>
       <tr>