Fix - trivial comment change in code

Hello,

Xymon 4.3.7 xymonnet.c has the following line (line 491):

     * - '|' denotes reverse test, i.e. service should be DOWN.

Surely the '|' should be a '!' character.


John.

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John Horne                   Tel: +XX (X)XXXX XXXXXX
Plymouth University, UK      Fax: +XX (X)XXXX XXXXXX