update suggestion for documentation and use of credit/debit & increase/decrease

[Jon Lapham]

Richard Schilling wrote:
> I'm going through the GnuCash help files, and notice the following in 
> section  2.2 of the Tutorial and Concepts guide (to which I'd like to 
> suggest changes - see below):

I think what I will do is put your suggested text into the 
documentation, since it is certainly better than what is currently 
there.  If anyone comes up with an alternative we can discuss it more. 
Sound good?

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  Jon Lapham  <lapham at jandr.org>                Rio de Janeiro, Brasil
  Personal: http://www.jandr.org/
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