plugins validate: docs update

docs/cli/connectctl_plugins.md

@@ -29,3 +29,4 @@ None, all options are at the subcommand level
 
 * [connectctl](connectctl.md)	 - connectctl: work with Kafka Connect easily
 * [connectctl plugins list](connectctl_plugins_list.md)     - List connector plugins
+* [connectctl plugins validate](connectctl_plugins_validate.md)     - Validates connector config

docs/cli/connectctl_plugins_validate.md

@@ -0,0 +1,33 @@
+## connectctl plugins validate
+
+Validates connector config
+
+### Synopsis
+
+Validate the provided configuration values against the configuration definition. This API performs per config validation, outputs suggested values and error messages during validation.
+It exits with code 1 if config is invalid.
+
+
+```
+connectctl plugins validate [flags]
+```
+
+### Options
+
+```
+  -c, --cluster string   the URL of the connect cluster (required)
+  -h, --help             help for validate
+  -i, --input string     Input data in json format (required)
+  -o, --output string    specify the output format (valid options: json, table) (default "json")
+  -q, --quiet            disable output logging
+```
+### Options inherited from parent commands
+
+```
+  -l, --loglevel loglevel       Specify the loglevel for the program (default info)
+      --logfile                 Specify a file to output logs to
+```
+
+### SEE ALSO
+
+* [connectctl plugins](connectctl_plugins.md)	 - Manage plugins