[DOCS] Removes 6.3.1 release notes

Author: lcawl

docs/reference/release-notes.asciidoc

@@ -6,7 +6,6 @@
 
 This section summarizes the changes in each release.
 
-* <<release-notes-6.3.1>>
 * <<release-notes-6.3.0>>
 * <<release-notes-6.2.4>>
 * <<release-notes-6.2.3>>

docs/reference/release-notes/6.3.asciidoc

@@ -34,40 +34,6 @@
 //=== Known Issues
 ////
 
-[[release-notes-6.3.1]]
-== Elasticsearch version 6.3.1
-
-coming[6.3.1]
-
-//[float]
-[[breaking-6.3.1]]
-//=== Breaking Changes
-
-//[float]
-//=== Breaking Java Changes
-
-//[float]
-//=== Deprecations
-
-//[float]
-//=== New Features
-
-//[float]
-//=== Enhancements
-
-[float]
-=== Bug Fixes
-
-Reduce the number of object allocations made by {security} when resolving the indices and aliases for a request ({pull}30180[#30180])
-
-Respect accept header on requests with no handler ({pull}30383[#30383])
-
-//[float]
-//=== Regressions
-
-//[float]
-//=== Known Issues
-
 [[release-notes-6.3.0]]
 == {es} version 6.3.0
 
@@ -101,8 +67,12 @@ elasticsearch plugin.
 //[float]
 //=== Enhancements
 
-//[float]
-//=== Bug Fixes
+[float]
+=== Bug Fixes
+
+Security::
+* Reduces the number of object allocations made by {security} when resolving the indices and aliases for a request ({pull}30180[#30180])
+* Respects accept header on requests with no handler ({pull}30383[#30383])
 
 //[float]
 //=== Regressions