Add release notes and release highlights for 1.1.1 (#3047)

Author: sebgl

docs/release-notes/1.1.1.asciidoc

@@ -0,0 +1,17 @@
+:issue: https://github.com/elastic/cloud-on-k8s/issues/
+:pull: https://github.com/elastic/cloud-on-k8s/pull/
+
+[[release-notes-1.1.1]]
+== {n} version 1.1.1
+
+[[enhancement-1.1.1]]
+[float]
+=== Enhancements
+
+* Increase the operator default memory requirements {pull}3046[#3046] (issue: {issue}3025[#3025])
+
+[[bug-1.1.1]]
+[float]
+=== Bug fixes
+
+* Restore transport certs public secret naming scheme from 1.0 {pull}3035[#3035] (issue: {issue}3034[#3034])

docs/release-notes/highlights-1.1.1.asciidoc

@@ -0,0 +1,5 @@
+[[release-highlights-1.1.1]]
+== 1.1.1 release highlights
+
+This release addresses an issue with the name of the Secret containing the Elasticsearch transport certificates.
+It also increases the default memory requirements for the operator Pod.