Help: Drop development topic notes to prepare release

Release versions do not have the development topic section of
the CMake Release Notes index page.

Help/release/dev/0-sample-topic.rst

diff --git a/Help/release/dev/0-sample-topic.rst b/Help/release/dev/0-sample-topic.rst
deleted file mode 100644
index e4cc01e..0000000
--- a/Help/release/dev/0-sample-topic.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-0-sample-topic
---------------
-
-* This is a sample release note for the change in a topic.
-  Developers should add similar notes for each topic branch
-  making a noteworthy change.  Each document should be named
-  and titled to match the topic name to avoid merge conflicts.

Help/release/index.rst

diff --git a/Help/release/index.rst b/Help/release/index.rst
index d434a3a..c82889f 100644
--- a/Help/release/index.rst
+++ b/Help/release/index.rst
@@ -7,8 +7,6 @@
   This file should include the adjacent "dev.txt" file
   in development versions but not in release versions.
 
-.. include:: dev.txt
-
 Releases
 ========