removed useless spaces

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/envvars.h

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 /////////////////////////////////////////////////////////////////////////////
 
 /*!
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  @page envvars_overview Environment variables
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  This section describes all environment variables that affect execution of
  wxWidgets programs.
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  @c WXTRACE
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  (Debug build only.)
  This variable can be set to a comma-separated list of trace masks used in
  #wxLogTrace calls;
  wxLog::AddTraceMask is called for every mask
  in the list during wxWidgets initialization.
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  @c WXPREFIX
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  (Unix only.)
  Overrides installation prefix. Normally, the prefix
  is hard-coded and is the same as the value passed to @c configure via
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  @c /usr/local or @c /usr). You can set WXPREFIX if you are for example
  distributing a binary version of an application and you don't know in advance
  where it will be installed.
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  @c WXMODE
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  (wxMGL only.)
  Sets MGL video mode. The value must be in form
  @e widthx@e height-@e depth. The default is @c 640x480-16.
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  @c WXSTDERR
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  (wxMGL only.)
  Redirects stderr output to a file.
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  */
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