[Gimp-docs] comment in src/using/fileformats.xml

[Marco Ciampa]

This comment present in src/using/fileformats.xml:

  <!--Please don't delete. This file is hard to find from html file-->
  <para><subscript>src/using/fileformats.xml</subscript></para>


is really necessary? 
Couldn't be avoided with a simple recursive string grep on src dir?

-- 

Marco Ciampa

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| FSFE fellow   #364 |
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