Docs: Fix broken reference (#769)

Author: ncbaratta

documentation/book/ref-bootstrap-servers.adoc

@@ -2,7 +2,7 @@
 //
 // assembly-bootstrap-servers.adoc
 
-[id='ref-bootstrap servers-{context}']
+[id='ref-bootstrap-servers-{context}']
 = Bootstrap servers
 
 List of bootstrap servers can be configured in the `bootstrapServers` property in `KafkaConnect.spec` and `KafkaConnectS2I.spec`.
@@ -20,4 +20,4 @@ spec:
   # ...
   bootstrapServers: my-cluster-kafka-bootstrap:9092
   # ...
-----
+----

documentation/book/ref-operators-cluster-operator-configuration.adoc

@@ -65,4 +65,4 @@ if no image is specified as the `Kafka.spec.entityOperator.userOperator.image` i
 
 `STRIMZI_DEFAULT_TLS_SIDECAR_ENTITY_OPERATOR_IMAGE`:: Optional, default `strimzi/entity-operator-stunnel:latest`.
 The image name to use as the default when deploying the sidecar container which provides TLS support for the Entity Operator, if
-no image is specified as the `Kafka.spec.entityOperator.tlsSidecar.image` in the xref:assembly-configuring-container-images-deployment-configuration-kafka[].
+no image is specified as the `Kafka.spec.entityOperator.tlsSidecar.image` in the xref:assembly-configuring-container-images-deployment-configuration-kafka[].