ReleaseNotes: remote the ... stuff

git-svn-id: https://llvm.org/svn/llvm-project/polly/branches/release_60@326200 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
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--- a/docs/ReleaseNotes.rst
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@@ -1,7 +1,3 @@
 =================
 Release Notes 6.0
 =================
-
-In Polly 6 the following important changes have been incorporated.
-
-- Change ...