[gimp-help/gimp-help-2-10] Update for RGB Noise filter

[Jacob Boerema <jboerema src gnome org>]

commit c4223ad2fc847d2583d67550d608858d7853d363
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Tue Jun 14 21:52:40 2022 +0200

    Update for RGB Noise filter
    
    (cherry picked from commit 07f68504cf558440b146be6ab70ff2e4f12ce6d0)

 src/filters/noise/rgb-noise.xml | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)
---
diff --git a/src/filters/noise/rgb-noise.xml b/src/filters/noise/rgb-noise.xml
index 8e2aa274b..f87d57e9f 100644
--- a/src/filters/noise/rgb-noise.xml
+++ b/src/filters/noise/rgb-noise.xml
@@ -52,9 +52,6 @@
     <para>
       The result is very naturally looking noise.
     </para>
-    <para>
-      This filter does not work with indexed images.
-    </para>
   </sect3>
 
   <sect3>
@@ -104,9 +101,10 @@
         <listitem>
           <para>
             When this radio button is checked, you can move each RGB slider
-            separately.  Otherwise, sliders R, G and B will be moved all
-            together. The same relative noise will then be added to all
-            channels in each pixel, so the hue of pixels does not change much.
+            separately. Otherwise, the sliders R, G and B will be replaced by
+            a single slider Value. The same relative noise will then be added
+            to all channels in each pixel, so the hue of pixels does not change
+            much.
           </para>
         </listitem>
       </varlistentry>
@@ -135,10 +133,7 @@
         <listitem>
           <para>
             These slidebars and adjacent input boxes allow to set noise level
-            (0.00&nbsp;-&nbsp;1.00) in each channel. Alpha channel is only
-            present if your layer holds such a channel. In case of a grayscale
-            image, a <guilabel>Grey</guilabel> is shown instead of color
-            sliders.
+            (0.00&nbsp;-&nbsp;1.00) in each channel.
           </para>
           <para>
             The value set by these sliders actually determine the standard
@@ -149,6 +144,18 @@
           </para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term>Random seed</term>
+        <listitem>
+          <para>
+            Controls randomness of noise. If the same random seed is used in
+            the same situation, the filter produces exactly the same
+            results. A different random seed produces different
+            results. Random seed can be entered manually or generated
+            randomly by pressing the <guibutton>New Seed</guibutton> button.
+          </para>
+        </listitem>
+      </varlistentry>
     </variablelist>
   </sect3>
 </sect2>