Mark decode_cef as GA in documentation (elastic#17944)

decode_syslog is no longer in beta. It is used by the cef module which is not beta.

Co-authored-by: Andrew Kroh <andrew.kroh@elastic.co>
(cherry picked from commit 2e4c7c3)

CHANGELOG.next.asciidoc

@@ -350,6 +350,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Added Unix stream socket support as an input source and a syslog input source. {pull}17492[17492]
 - Improve ECS categorization field mappings in misp module. {issue}16026[16026] {pull}17344[17344]
 - Enhance `elasticsearch/deprecation` fileset to handle ECS-compatible logs emitted by Elasticsearch. {issue}17715[17715] {pull}17728[17728]
+- Make `decode_cef` processor GA. {pull}17944[17944]
 - Improve ECS categorization field mappings in redis module. {issue}16179[16179] {pull}17918[17918]
 - Improve ECS categorization field mappings in rabbitmq module. {issue}16178[16178] {pull}17916[17916]
 - Improve ECS categorization field mappings in postgresql module. {issue}16177[16177] {pull}17914[17914]

x-pack/filebeat/processors/decode_cef/decode_cef.go

@@ -14,7 +14,6 @@ import (
 
 	"github.com/elastic/beats/v7/libbeat/beat"
 	"github.com/elastic/beats/v7/libbeat/common"
-	"github.com/elastic/beats/v7/libbeat/common/cfgwarn"
 	"github.com/elastic/beats/v7/libbeat/logp"
 	"github.com/elastic/beats/v7/libbeat/processors"
 	"github.com/elastic/beats/v7/x-pack/filebeat/processors/decode_cef/cef"
@@ -45,8 +44,6 @@ func New(cfg *common.Config) (processors.Processor, error) {
 }
 
 func newDecodeCEF(c config) (*processor, error) {
-	cfgwarn.Beta("The " + procName + " processor is a beta feature.")
-
 	log := logp.NewLogger(logName)
 	if c.ID != "" {
 		log = log.With("instance_id", c.ID)

x-pack/filebeat/processors/decode_cef/docs/decode_cef.asciidoc

@@ -6,8 +6,6 @@
 <titleabbrev>decode_cef</titleabbrev>
 ++++
 
-beta[]
-
 The `decode_cef` processor decodes Common Event Format (CEF) messages. This
 processor is available in Filebeat.