Update changelog 3.6 to clearly requiring applications which depend o…

…n etcd 3.6 packages must be built with go version >= 1.18

etcdserver starts to using generic in etcd-io#14515,
so any applications which depend on package `go.etcd.io/etcd/server/v3' must be
built with go version >= 1.18.

Most likely we may depends on go 1.18 new features in other packages, i.e. client, pkg,
so we just simplify the changelog message to require applications depending on any
etcd 3.6 pacakges must be built with go version >= 1.18, although only etcdserver uses
go generic for now.

Signed-off-by: Benjamin Wang <wachao@vmware.com>

CHANGELOG/CHANGELOG-3.6.md

@@ -12,7 +12,8 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v3.6.0).
 
 - `etcd` will no longer start on data dir created by newer versions (for example etcd v3.6 will not run on v3.7+ data dir). To downgrade data dir please check out `etcdutl migrate` command.
 - `etcd` doesn't support serving client requests on the peer listen endpoints (--listen-peer-urls). See [pull/13565](https://github.com/etcd-io/etcd/pull/13565).
-- `etcdctl` will sleep(2s) in case of range delete without `--range` flag.See [pull/13747](https://github.com/etcd-io/etcd/pull/13747)
+- `etcdctl` will sleep(2s) in case of range delete without `--range` flag. See [pull/13747](https://github.com/etcd-io/etcd/pull/13747)
+- Applications which depend on etcd 3.6 packages must be built with go version >= 1.18.
 
 ### Deprecations