docs: use markdown for <envar> tags
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@ -339,7 +339,7 @@ gdk_parse_args (int *argc,
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* gdk_get_display:
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*
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* Gets the name of the display, which usually comes from the
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* <envar>DISPLAY</envar> environment variable or the
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* `DISPLAY` environment variable or the
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* <option>--display</option> command line option.
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*
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* Returns: the name of the display.
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@ -232,7 +232,7 @@ static const gchar *allowed_backends;
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* followed by the Quartz backend, and then all
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* others.
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*
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* If the <envar>GDK_BACKEND</envar> environment variable
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* If the `GDK_BACKEND` environment variable
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* is set, it determines what backends are tried in what
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* order, while still respecting the set of allowed backends
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* that are specified by this function.
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@ -286,7 +286,7 @@ static GdkBackend gdk_backends[] = {
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* Gets the singleton #GdkDisplayManager object.
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*
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* When called for the first time, this function consults the
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* <envar>GDK_BACKEND</envar> environment variable to find out which
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* `GDK_BACKEND` environment variable to find out which
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* of the supported GDK backends to use (in case GDK has been compiled
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* with multiple backends). Applications can use gdk_set_allowed_backends()
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* to limit what backends can be used.
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@ -454,7 +454,7 @@ gdk_x11_get_default_root_xwindow (void)
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*
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* Return value: (transfer none): the Xlib Display* for
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* the display specified in the <option>--display</option> command
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* line option or the <envar>DISPLAY</envar> environment variable.
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* line option or the `DISPLAY` environment variable.
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**/
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Display *
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gdk_x11_get_default_xdisplay (void)
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