[gtkmm-documentation/wip/dboles/formatting-3: 3/10] Update an out-of-date reference to a minor version

[Daniel Boles <dboles src gnome org>]

commit 8ac71e9cd67873db9f0cac40e870d23217d6a37f
Author: Daniel Boles <dboles src gmail com>
Date:   Sun Jan 14 19:49:10 2018 +0000

    Update an out-of-date reference to a minor version

 docs/tutorial/C/index-in.docbook |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/docs/tutorial/C/index-in.docbook b/docs/tutorial/C/index-in.docbook
index 531b6e2..ee6b810 100644
--- a/docs/tutorial/C/index-in.docbook
+++ b/docs/tutorial/C/index-in.docbook
@@ -226,10 +226,11 @@ applications and libraries:
 </para>
 <note>
 <para>
-The package names will not change when new API/ABI-compatible versions of &gtkmm;
-are released. Otherwise they would not be API/ABI-compatible. So don't be
-surprised, for instance, to find &gtkmm; 3.8 supplied by Debian's
-<application>libgtkmm-3.0-dev</application> package.
+    The package names will not change when new API/ABI-compatible versions of
+    &gtkmm; are released. Otherwise they would not be API/ABI-compatible. As
+    &gtkmm; 3.0 was was released in 2011, your distro most likely supplies a
+    later minor version, such as the long-term stable 3.22, under the
+    package/API name <application>gtkmm-3.0</application>.
 </para>
 </note>
 </sect2>