use of '=' in long options documentation

Looking at our ref pages, I see some manual pages specify long options
that take arguments using '=', e.g. initdb.sgml:

    --long-opt=opt

and some do not, e.g. pg_dump.sgml:

    --long-opt opt

So, which should we use, for consistency?

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +