mkromfs doc improvement

[Jonathan Larmour]

As per http://bugs.ecos.sourceware.org/show_bug.cgi?id=1000293

2008-08-14  Klaas Gadeyne  <klaas.gadeyne@fmtc.be>
2008-08-14  Jonathan Larmour  <jifl@eCosCentric.com>

        * doc/mk_romfs.txt (Usage): Remove documentation about obsolete
        CYGNUM_FS_ROM_BASE_ADDRESS option, and replace with better
        usage description.

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