Fix docs for translate_sid processor (#16961)

I forgot to change the conditional for ifdef to ifndef. It was also missing a changelog entry.

Author: andrewkroh

CHANGELOG.next.asciidoc

@@ -140,6 +140,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Add Kerberos support to Kafka input and output. {pull}16781[16781]
 - Add `add_cloudfoundry_metadata` processor to annotate events with Cloud Foundry application data. {pull}16621[16621
 - Add support for kubernetes provider to recognize namespace level defaults {pull}16321[16321]
+- Add `translate_sid` processor on Windows for converting Windows security identifier (SID) values to names. {issue}7451[7451] {pull}16013[16013]
 
 *Auditbeat*
 

libbeat/docs/processors-list.asciidoc

@@ -98,7 +98,7 @@ endif::[]
 ifndef::no_truncate_fields_processor[]
 * <<truncate-fields, `truncate_fields`>>
 endif::[]
-ifdef::no_translate_sid_processor[]
+ifndef::no_translate_sid_processor[]
 * <<processor-translate-sid, `translate_sid`>>
 endif::[]
 //# end::processors-list[]
@@ -200,7 +200,7 @@ endif::[]
 ifndef::no_truncate_fields_processor[]
 include::{libbeat-processors-dir}/actions/docs/truncate_fields.asciidoc[]
 endif::[]
-ifdef::no_translate_sid_processor[]
+ifndef::no_translate_sid_processor[]
 include::{libbeat-processors-dir}/translate_sid/docs/translate_sid.asciidoc[]
 endif::[]