[gimp-help] Add Move and delete sample point

[Julien Hardlin <jhardlin src gnome org>]

commit c7ed168c10f1801edcc446b8126f97ba5378135f
Author: Julien Hardelin <jhardlin orange fr>
Date:   Sun Feb 23 07:17:41 2020 +0100

    Add Move and delete sample point

 src/dialogs/sample-points.xml | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)
---
diff --git a/src/dialogs/sample-points.xml b/src/dialogs/sample-points.xml
index b44275106..393f9b2c0 100644
--- a/src/dialogs/sample-points.xml
+++ b/src/dialogs/sample-points.xml
@@ -98,11 +98,23 @@
     </para>
 
     <para>
-      In GIMP-2.8, you could delete a sample point, as you do with guides, by
-      click-and-dragging it up to a rule. This is no longer possible with 
-      GIMP-2.10: you can delete sample points using Edit/Undo 
-      (<keycombo><keycap>Ctrl</keycap><keycap>Z</keycap></keycombo>).
+      To move or delete a sample point:
+      <itemizedlist>
+        <listitem>
+          <para>
+            Using the Eye Dropper tool, simply click-and-drag the sample 
+            point, up to a ruler to delete it.
+          </para>
+        </listitem>
+        <listitem>
+          <para>
+            Using a paint tool, <keycap>Ctrl</keycap> + click-and-drag the 
+            sample point, up to a ruler to delete it.
+          </para>
+        </listitem>
+      </itemizedlist>
     </para>
+    
     <para>
       By default, sampling is performed on all layers. If you want to
       sample on the active layer only, uncheck the <guilabel>Sample