Update filebeat azure module documentation (elastic#20815)

* mofidy doc

* fix doc

* changelog

(cherry picked from commit 7fbbdca)

CHANGELOG.next.asciidoc

@@ -75,6 +75,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fixed typo in log message. {pull}17897[17897]
 - Fix long registry migration times. {pull}20717[20717] {issue}20705[20705]
 - Fix event types and categories in auditd module to comply with ECS {pull}20652[20652]
+- Update documentation in the azure module filebeat. {pull}20815[20815]
 
 *Heartbeat*
 

filebeat/docs/modules/azure.asciidoc

@@ -58,7 +58,7 @@ Will retrieve azure Active Directory audit logs. The audit logs provide traceabi
    signinlogs:
      enabled: false
      var:
-       eventhub: ["insights-logs-signinlogs"]
+       eventhub: "insights-logs-signinlogs"
        consumer_group: "$Default"
        connection_string: ""
        storage_account: ""
@@ -69,9 +69,9 @@ Will retrieve azure Active Directory audit logs. The audit logs provide traceabi
 
 
 `eventhub` ::
-  _[]string_
-Is a fully managed, real-time data ingestion service.
-Default value `insights-operational-logs`
+  _string_
+Is the fully managed, real-time data ingestion service.
+Default value `insights-operational-logs`.
 
 `consumer_group` ::
 _string_

x-pack/filebeat/module/azure/_meta/docs.asciidoc

@@ -53,7 +53,7 @@ Will retrieve azure Active Directory audit logs. The audit logs provide traceabi
    signinlogs:
      enabled: false
      var:
-       eventhub: ["insights-logs-signinlogs"]
+       eventhub: "insights-logs-signinlogs"
        consumer_group: "$Default"
        connection_string: ""
        storage_account: ""
@@ -64,9 +64,9 @@ Will retrieve azure Active Directory audit logs. The audit logs provide traceabi
 
 
 `eventhub` ::
-  _[]string_
-Is a fully managed, real-time data ingestion service.
-Default value `insights-operational-logs`
+  _string_
+Is the fully managed, real-time data ingestion service.
+Default value `insights-operational-logs`.
 
 `consumer_group` ::
 _string_