docs: Remove false zookeeper installed statements (#892)

Author: xeniape

docs/modules/nifi/examples/getting_started/install_output.txt

@@ -1,5 +1,4 @@
 Installed commons=0.0.0-dev operator
 Installed secret=0.0.0-dev operator
 Installed listener=0.0.0-dev operator
-Installed zookeeper=0.0.0-dev operator
 Installed nifi=0.0.0-dev operator

docs/modules/nifi/examples/getting_started/install_output.txt.j2

@@ -1,5 +1,4 @@
 Installed commons={{ versions.commons }} operator
 Installed secret={{ versions.secret }} operator
 Installed listener={{ versions.listener }} operator
-Installed zookeeper={{ versions.zookeeper }} operator
 Installed nifi={{ versions.nifi }} operator

docs/templating_vars.yaml

@@ -6,5 +6,4 @@ versions:
   commons: 0.0.0-dev
   secret: 0.0.0-dev
   listener: 0.0.0-dev
-  zookeeper: 0.0.0-dev
   nifi: 0.0.0-dev