Remove references to RC files in the env var docs

docs/reference/gtk/running.sgml

@@ -248,7 +248,7 @@ additional environment variables.
 
   <para>
     Specifies an IM module to use in preference to the one determined
-    from the locale.  If this isn't set and you are running on the system
+    from the locale. If this isn't set and you are running on the system
     that enables <literal>XSETTINGS</literal> and has a value in
     <literal>Gtk/IMModule</literal>, that will be used for the default
     IM module.
@@ -260,11 +260,14 @@ additional environment variables.
 
   <para>
     Specifies the file listing the IM modules to load. This environment
-    variable overrides the <literal>im_module_file</literal> specified in
-    the RC files, which in turn overrides the default value
+    variable the default value
     <filename><replaceable>libdir</replaceable>/gtk-3.0/3.0.0/immodules.cache</filename>
     (<replaceable>libdir</replaceable> has the same meaning here as explained for <envar>GTK_PATH</envar>).
   </para>
+  <para>
+    The <filename>immodules.cache</filename> file is generated by the
+    <command>gtk-query-immodules-3.0</command> utility.
+  </para>
 </formalpara>
 
 <formalpara>
@@ -297,9 +300,13 @@ nevertheless.
   <para>
     Specifies the file listing the GdkPixbuf loader modules to load.
     This environment variable overrides the default value
-	<filename><replaceable>libdir</replaceable>/gtk-3.0/3.0.0/loaders.cache</filename>
+    <filename><replaceable>libdir</replaceable>/gtk-3.0/3.0.0/loaders.cache</filename>
     (<replaceable>libdir</replaceable> is the sysconfdir specified when
-	GTK+ was configured, usually <filename>/usr/local/lib</filename>.)
+    GTK+ was configured, usually <filename>/usr/local/lib</filename>.)
+  </para>
+  <para>
+    The <filename>loaders.cache</filename> file is generated by the
+    <command>gdk-pixbuf-query-loaders</command> utility.
   </para>
  </formalpara>