[gimp-help/gimp-help-2-10] filters: correct default value for threshold, description fix

[Jacob Boerema <jboerema src gnome org>]

commit 18314465720b617ef8142e29b36a6e90b3da3579
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Mon Feb 7 21:29:31 2022 +0100

    filters: correct default value for threshold, description fix
    
    (cherry picked from commit 45fb8fd9fd0c058d9c28dda0378dae66790023e9)

 src/filters/generic/convol-matrix.xml | 10 ++++++----
 src/filters/generic/distance-map.xml  |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/src/filters/generic/convol-matrix.xml b/src/filters/generic/convol-matrix.xml
index 8bc75f5d4..685ec167d 100644
--- a/src/filters/generic/convol-matrix.xml
+++ b/src/filters/generic/convol-matrix.xml
@@ -110,9 +110,10 @@
               <listitem>
                 <para>
                   The result of previous calculation will be divided by this
-                  divisor. You will hardly use 1, which lets result unchanged,
-                  and 9 or 25 according to matrix size, which gives the
-                  average of pixel values.
+                  divisor. You will hardly use anything else than 1, which
+                  leaves results unchanged, and 9 or 25 according to matrix size,
+                  which gives the average of pixel values. The divisor can only
+                  be changed when Normalize is unchecked.
                 </para>
               </listitem>
             </varlistentry>
@@ -121,7 +122,8 @@
               <listitem>
                 <para>
                   This value is added to the division result. This is useful
-                  if result may be negative. This offset may be negative.
+                  if result may be negative. This offset may be negative. It
+                  can only be changed when Normalize is unchecked.
                 </para>
               </listitem>
             </varlistentry>
diff --git a/src/filters/generic/distance-map.xml b/src/filters/generic/distance-map.xml
index 1547079fc..28c9579a5 100644
--- a/src/filters/generic/distance-map.xml
+++ b/src/filters/generic/distance-map.xml
@@ -157,7 +157,7 @@
         <term>Threshold high</term>
         <listitem>
           <para>
-            Default is 100. Decreasing this value makes result lighter.
+            Default is 1. Decreasing this value makes result darker.
           </para>
         </listitem>
       </varlistentry>