update release notes

Add notes for the dulwich work and the eol handling.

Clean up some existing notes that added prelude values incorrectly.

Change-Id: Id37f2f7ce8e2ce9723e5e8c3ecbebe227b62f4e2
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

releasenotes/notes/add-config-file-e77084792c1dc695.yaml

@@ -1,6 +1,4 @@
 ---
-prelude: >
-    Reno now supports having a configuration file!
 features:
   - |
     Reno now supports having a ``config.yaml`` file in your release notes

releasenotes/notes/branches-eol-bcafc2a007a1eb9f.yaml

@@ -0,0 +1,12 @@
+---
+features:
+  - |
+    Explicitly allow reno to scan starting from a tag by specifying the
+    tag where a branch name would otherwise be used.
+  - |
+    Add logic to allow reno to detect a branch that has been marked as
+    end-of-life using the OpenStack community's process of tagging the
+    HEAD of a stable/foo branch foo-eol before deleting the
+    branch. This means that references to "stable/foo" are translated
+    to "foo-eol" when the branch does not exist, and that Sphinx
+    directives do not need to be manually updated.

releasenotes/notes/dulwich-rewrite-3a5377162d97402b.yaml

@@ -0,0 +1,5 @@
+---
+prelude: >
+  This release includes a significant rewrite of the internal logic of
+  reno to access git data through the dulwich library instead of the
+  git command line porcelain.

releasenotes/notes/support-custom-template-0534a2199cfec44c.yaml

@@ -1,6 +1,4 @@
 ---
-prelude: >
-    Support to set a custom template used to create new notes
 features:
   - |
     Reno now supports to set through ``template`` attribute in

releasenotes/notes/support-edit-ec5c01ad6144815a.yaml

@@ -1,7 +1,5 @@
 ---
-prelude: >
-    Enable to create and edit a note with reno new --edit.
 features:
   - |
-    Reno now enables with reno new --edit to create a note and edit it with
+    Reno now enables with reno new ``--edit`` to create a note and edit it with
     your editor (defined with EDITOR environment variable).