[KYUUBI #1527] [DOC] Improve High Availability Guide

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### _Why are the changes needed?_
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  1. If you add a feature, you can talk about the use case of it.
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![image](https://user-images.githubusercontent.com/8326978/145179241-050e66aa-32d6-471d-82bd-a88972c3ca98.png)

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [x] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #1527 from yaooqinn/hadoc.

Closes #1527

249701b [Kent Yao] [DOC] Improve High Availability Guide
0324433 [Kent Yao] [DOC] Improve High Availability Guide
54c1cd9 [Kent Yao] [DOC] Improve High Availability Guide
6d8a099 [Kent Yao] [DOC] Improve High Availability Guide
5b4dff3 [Kent Yao] [DOC] Improve High Availability Guide

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Kent Yao <yao@apache.org>

Author: yaooqinn

docs/deployment/high_availability_guide.md

@@ -245,7 +245,7 @@ kyuubi\.ha\.zookeeper<br>\.connection\.max\.retry<br>\.wait|<div style='width: 6
 kyuubi\.ha\.zookeeper<br>\.connection\.retry<br>\.policy|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>EXPONENTIAL_BACKOFF</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The retry policy for connecting to the zookeeper ensemble, all candidates are: <ul><li>ONE_TIME</li><li> N_TIME</li><li> EXPONENTIAL_BACKOFF</li><li> BOUNDED_EXPONENTIAL_BACKOFF</li><li> UNTIL_ELAPSED</li></ul></div>|<div style='width: 30pt'>string</div>|<div style='width: 20pt'>1.0.0</div>
 kyuubi\.ha\.zookeeper<br>\.connection\.timeout|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>15000</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The timeout(ms) of creating the connection to the zookeeper ensemble</div>|<div style='width: 30pt'>int</div>|<div style='width: 20pt'>1.0.0</div>
 kyuubi\.ha\.zookeeper<br>\.engine\.auth\.type|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>NONE</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The type of zookeeper authentication for engine, all candidates are <ul><li>NONE</li><li> KERBEROS</li><li> DIGEST</li></ul></div>|<div style='width: 30pt'>string</div>|<div style='width: 20pt'>1.3.2</div>
-kyuubi\.ha\.zookeeper<br>\.namespace|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>kyuubi</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The root directory for the service to deploy its instance uri. Additionally, it will creates a -[username] suffixed root directory for each application</div>|<div style='width: 30pt'>string</div>|<div style='width: 20pt'>1.0.0</div>
+kyuubi\.ha\.zookeeper<br>\.namespace|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>kyuubi</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The root directory for the service to deploy its instance uri</div>|<div style='width: 30pt'>string</div>|<div style='width: 20pt'>1.0.0</div>
 kyuubi\.ha\.zookeeper<br>\.node\.creation\.timeout|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>PT2M</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>Timeout for creating zookeeper node</div>|<div style='width: 30pt'>duration</div>|<div style='width: 20pt'>1.2.0</div>
 kyuubi\.ha\.zookeeper<br>\.publish\.configs|<div style='width: 65pt;word-wrap: break-word;white-space: normal'>false</div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>Whether we should publish Kerberos configs to ZooKeeper.</div>|<div style='width: 30pt'>boolean</div>|<div style='width: 20pt'>1.4.0</div>
 kyuubi\.ha\.zookeeper<br>\.quorum|<div style='width: 65pt;word-wrap: break-word;white-space: normal'></div>|<div style='width: 170pt;word-wrap: break-word;white-space: normal'>The connection string for the zookeeper ensemble</div>|<div style='width: 30pt'>string</div>|<div style='width: 20pt'>1.0.0</div>

docs/deployment/settings.md

@@ -35,8 +35,7 @@ object HighAvailabilityConf {
     .createWithDefault("")
 
   val HA_ZK_NAMESPACE: ConfigEntry[String] = buildConf("ha.zookeeper.namespace")
-    .doc("The root directory for the service to deploy its instance uri. Additionally, it will" +
-      " creates a -[username] suffixed root directory for each application")
+    .doc("The root directory for the service to deploy its instance uri")
     .version("1.0.0")
     .stringConf
     .createWithDefault("kyuubi")