Doc: ChangeLog: update for 2.1.3-rc2 release

ChangeLog

@@ -1,3 +1,21 @@
+* Mon May 16 2022 Ken Gaillot <kgaillot@redhat.com> Pacemaker-2.1.3-rc2
+- Changesets: 28
+- Diff: 24 files changed, 810 insertions(+), 156 deletions(-)
+
+- Features added since Pacemaker-2.1.3-rc1
+  + rpm: crm_attribute is now part of the pacemaker-cli package instead of
+         the pacemaker package
+
+- Fixes since Pacemaker-2.1.3-rc1
+  + scheduler: make multiple-active="stop_unexpected" actually work
+  + libcrmcommon: retry IPC requests after EAGAIN errors
+  + tools: get attrd_updater -Y working again (regression in 2.1.3-rc1)
+  + tools: support command-line crm_attribute calls on Pacemaker remote nodes
+           whose node name in the cluster differs from their local hostname
+
+- Public API changes since Pacemaker-2.1.3-rc1
+  + libstonithd: deprecate stonith_t:call_timeout
+
 * Mon Apr 18 2022 Ken Gaillot <kgaillot@redhat.com> Pacemaker-2.1.3-rc1
 - Changesets: 779
 - Diff: 330 files changed, 22740 insertions(+), 12103 deletions(-)