Fix field alias for nginx.access.remote_ip (elastic#11512)

- It was missing in the breaking changes doc (generated from ecs-migration.yml)
- The actual field alias was incorrectly pointing to source.ip, this has been
  adjusted to source.address
- Re-generating the documentation file also updated the breaking changes to
  include a change introduced in elastic#11334

This should be backported to 7.0.

Closes elastic#11510

dev-tools/ecs-migration.yml

@@ -1151,6 +1151,11 @@
 
 ## NGINX module
 
+- from: nginx.access.remote_ip
+  to: source.address
+  alias: true
+  beat: filebeat
+
 - from: nginx.access.user_name
   to: user.name
   alias: true

filebeat/docs/fields.asciidoc

@@ -11456,7 +11456,7 @@ alias to: http.response.body.bytes
 --
 type: alias
 
-alias to: source.ip
+alias to: source.address
 
 --
 

filebeat/module/nginx/access/_meta/fields.yml

@@ -16,7 +16,7 @@
       migration: true
     - name: remote_ip
       type: alias
-      path: source.ip
+      path: source.address
       migration: true
     - name: user_name
       type: alias

libbeat/docs/field-name-changes.asciidoc

@@ -231,6 +231,7 @@
 |`nginx.access.http_version`            |`http.version`
 |`nginx.access.method`            |`http.request.method`
 |`nginx.access.referrer`            |`http.request.referrer`
+|`nginx.access.remote_ip`            |`source.address`
 |`nginx.access.response_code`            |`http.response.status_code`
 |`nginx.access.url`            |`url.original`
 |`nginx.access.user_agent.device`            |`user_agent.device.name`
@@ -295,7 +296,6 @@
 |`system.auth.hostname`            |`host.hostname`
 |`system.auth.pid`            |`process.pid`
 |`system.auth.program`            |`process.name`
-|`system.auth.ssh.event`            |`event.action`
 |`system.auth.ssh.geoip.city_name`            |`source.geo.city_name`
 |`system.auth.ssh.geoip.continent_name`            |`source.geo.continent_name`
 |`system.auth.ssh.geoip.country_iso_code`            |`source.geo.country_iso_code`