Add new beta protocols to Gateway protocol detection docs (#28669)

* Add new beta protocols to Gateway protocol detection docs

Add IMAP, POP3, SMTP, MYSQL, RSYNC-DAEMON, LDAP, and NTP to the
supported protocols table with Beta badges.

* Fix existing protocol table: separate HTTP/HTTP2, rename DCERPC, remove DNP3

* Add descriptive notes to existing protocols in supported protocols table

Author: Encore-Encore

src/content/docs/cloudflare-one/traffic-policies/network-policies/protocol-detection.mdx

@@ -45,13 +45,20 @@ Gateway supports detection and filtering of the following protocols:
 
 | Protocol | Notes                                                                                       |
 | -------- | ------------------------------------------------------------------------------------------- |
-| HTTP     | The policy builder includes separate values for HTTP/1.1 and HTTP/2.                        |
-| SSH      |                                                                                             |
-| TLS      | Gateway detects TLS versions 1.1 through 1.3 with the _TLS_ value.                          |
-| DCE/RPC  |                                                                                             |
-| MQTT     |                                                                                             |
-| TPKT     | TPKT commonly initiates RDP sessions, so you can use it to identify and filter RDP traffic. |
-| DNP3     |                                                                                             |
+| HTTP     | Hypertext Transfer Protocol (HTTP/1.1).                                                     |
+| HTTP2    | Hypertext Transfer Protocol Version 2.                                                      |
+| SSH      | Secure Shell Protocol — remote login and command execution.                                  |
+| TLS      | Transport Layer Security. Gateway detects TLS versions 1.1 through 1.3 with the _TLS_ value. |
+| DCERPC   | Distributed Computing Environment / Remote Procedure Call.                                   |
+| MQTT     | Message Queuing Telemetry Transport — lightweight IoT messaging protocol.                    |
+| TPKT     | TPKT commonly initiates RDP sessions, so you can use it to identify and filter RDP traffic.  |
+| IMAP <Badge text="Beta" variant="caution" size="small" />         | Internet Message Access Protocol — email retrieval.  |
+| POP3 <Badge text="Beta" variant="caution" size="small" />         | Post Office Protocol v3 — email retrieval.           |
+| SMTP <Badge text="Beta" variant="caution" size="small" />         | Simple Mail Transfer Protocol — email sending.       |
+| MYSQL <Badge text="Beta" variant="caution" size="small" />        | MySQL database wire protocol.                        |
+| RSYNC-DAEMON <Badge text="Beta" variant="caution" size="small" /> | rsync daemon protocol.                               |
+| LDAP <Badge text="Beta" variant="caution" size="small" />         | Lightweight Directory Access Protocol.               |
+| NTP <Badge text="Beta" variant="caution" size="small" />          | Network Time Protocol.                               |
 
 ## Example network policy