#1 tweak GUI_introduction about ma_clientrc

[David Crossley]

As a new user, i was confused by the Java GUI because
it was looking very raw (blue, and missing many menu
options 'indicators'). It was as though it was not
finding a configuration file.

I do have $MAS_DIRECTORY set. The doc GUI_introduction
says to put the .ma_clientrc file in the current
directory, but it did not find it there. Using 'magc'
and not knowing about the -nocd option was my trouble.
By default 'magc' does cd to $MAS_DIRECTORY and
successfully finds its .ma_clientrc there.

It took me ages to figure that out, Du'oh. Anyway, this
patch adds a hint to the doco.

[David Crossley]

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