[glib: 1/2] docs: Mention environment variables in `gio open` documentation

[Nirbheek Chauhan <nirbheekc src gnome org>]

commit b2eb0a6f1545af9d8282ec6636e0fd1b2d39865c
Author: Philip Withnall <withnall endlessm com>
Date:   Sun Aug 25 11:05:07 2019 +0300

    docs: Mention environment variables in `gio open` documentation
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    Closes: #1803

 docs/reference/gio/gio.xml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/docs/reference/gio/gio.xml b/docs/reference/gio/gio.xml
index 3de69642a..bd0c66e8e 100644
--- a/docs/reference/gio/gio.xml
+++ b/docs/reference/gio/gio.xml
@@ -506,6 +506,8 @@
             <filename><envar>$XDG_DATA_HOME</envar>/applications/mimeapps.list</filename>.</para>
           <para>The <command>mime</command> command can be used to change the default handler for
             a mimetype.</para>
+          <para>Environment variables will not be set on the application, as it
+            may be an existing process which is activated to handle the new file.</para>
         </listitem>
       </varlistentry>