[gtkmm-documentation: 1/2] PO-files: added: why `fuzzy` tag appears.

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 66a4c0825c2a1be2f6e85c05deb8fb47c3e775be
Author: DarkTrick <notebook22312 gmail com>
Date:   Wed Sep 15 02:25:16 2021 +0000

    PO-files: added: why `fuzzy` tag appears.

 docs/tutorial/C/index-in.docbook | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/docs/tutorial/C/index-in.docbook b/docs/tutorial/C/index-in.docbook
index 873ce4b..9192176 100644
--- a/docs/tutorial/C/index-in.docbook
+++ b/docs/tutorial/C/index-in.docbook
@@ -6664,6 +6664,8 @@ textdomain(GETTEXT_PACKAGE);</programlisting>
       <literal>fuzzy</literal> in the <filename>.po</filename> file.
       These translations will not substitute the original string. To make
       them appear, simply remove the <literal>fuzzy</literal> tag.
+      A <literal>Fuzzy</literal> tag appears if a string content changed, 
+      but the location is still the same.
       </para>
     </note>
   </sect2>