doc: update uri-blocker plugin docs (#1997)

doc/plugins/uri-blocker.md

@@ -36,7 +36,7 @@ The plugin helps we intercept user requests, we only need to indicate the `block
 |Name          |Requirement  |Description|
 |---------     |--------|-----------|
 |block_rules  |required|Regular filter rule array. Each of these items is a regular rule. If the current request URI hits any one of them, set the response code to rejected_code to exit the current user request. Example: `["root.exe", "root.m+"]`.|
-|rejected_code |optional|The HTTP status code returned when the request URI hit any of `filter_rule`, default `403`.|
+|rejected_code |optional|The HTTP status code returned when the request URI hit any of `block_rules`, default `403`.|
 
 ## How To Enable
 
@@ -76,9 +76,7 @@ Server: APISIX web server
 
 ## Disable Plugin
 
-When you want to disable the `uri blocker` plugin, it is very simple,
- you can delete the corresponding json configuration in the plugin configuration,
-  no need to restart the service, it will take effect immediately:
+When you want to disable the `uri blocker` plugin, it is very simple, you can delete the corresponding json configuration in the plugin configuration, no need to restart the service, it will take effect immediately:
 
 ```shell
 curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '