chore: CLIENT HELP doc added (#453)

* chore: CLIENT HELP doc added

* fix: review comments

Author: vyavdoshenko

docs/command-reference/server-management/client-help.md

@@ -0,0 +1,66 @@
+---
+description:  Learn how to use Redis CLIENT HELP command to list all CLIENT subcommands and their descriptions.
+---
+
+import PageTitle from '@site/src/components/PageTitle';
+
+# CLIENT HELP
+
+<PageTitle title="Redis CLIENT HELP Command (Documentation) | Dragonfly" />
+
+## Syntax
+
+    CLIENT HELP
+
+**Time complexity:** O(1)
+
+**ACL categories:** @slow
+
+The `CLIENT HELP` command returns a helpful text describing the different `CLIENT` subcommands supported by Dragonfly.
+
+## Return
+
+[Array reply](https://redis.io/docs/latest/develop/reference/protocol-spec/#arrays): a list of subcommands and their descriptions.
+
+## Example
+
+The output of the `CLIENT HELP` command includes entries similar to the following (as implemented in Dragonfly):
+
+```shell
+dragonfly> CLIENT HELP
+ 1) CLIENT <subcommand> [<arg> [value] [opt] ...]. Subcommands are:
+ 2) CACHING (YES|NO)
+ 3)     Enable/disable tracking of the keys for next command in OPTIN/OPTOUT modes.
+ 4) GETNAME
+ 5)     Return the name of the current connection.
+ 6) ID
+ 7)     Return the ID of the current connection.
+ 8) KILL <ip:port>
+ 9)     Kill connection made from <ip:port>.
+10) KILL <option> <value> [<option> <value> [...]]
+11)     Kill connections. Options are:
+12)     * ADDR (<ip:port>|<unixsocket>:0)
+13)       Kill connections made from the specified address
+14)     * LADDR (<ip:port>|<unixsocket>:0)
+15)       Kill connections made to specified local address
+16)     * ID <client-id>
+17)       Kill connections by client id.
+18) LIST
+19)     Return information about client connections.
+20) UNPAUSE
+21)     Stop the current client pause, resuming traffic.
+22) PAUSE <timeout> [WRITE|ALL]
+23)     Suspend all, or just write, clients for <timeout> milliseconds.
+24) SETNAME <name>
+25)     Assign the name <name> to the current connection.
+26) SETINFO <option> <value>
+27) Set client meta attr. Options are:
+28)     * LIB-NAME: the client lib name.
+29)     * LIB-VER: the client lib version.
+30) TRACKING (ON|OFF) [OPTIN] [OPTOUT] [NOLOOP]
+31)     Control server assisted client side caching.
+32) MIGRATE <client-id> <tid>
+33)     Migrates connection specified by client-id to the specified thread id.
+34) HELP
+35)     Print this help.
+```

docs/command-reference/server-management/client.md

@@ -16,4 +16,19 @@ import PageTitle from '@site/src/components/PageTitle';
 
 This is a container command for client connection commands.
 
+Currently, the following subcommands are supported:
+
+- CLIENT CACHING
+- [CLIENT GETNAME](./client-getname.md)
+- [CLIENT ID](./client-id.md)
+- [CLIENT KILL](./client-kill.md)
+- [CLIENT LIST](./client-list.md)
+- [CLIENT UNPAUSE](./client-unpause.md)
+- [CLIENT PAUSE](./client-pause.md)
+- [CLIENT SETNAME](./client-setname.md)
+- [CLIENT SETINFO](./client-setinfo.md)
+- [CLIENT TRACKING](./client-tracking.md)
+- CLIENT MIGRATE
+- [CLIENT HELP](./client-help.md)
+
 <!-- To see the list of available commands you can call `CLIENT HELP`. -->