Merge pull request #7630 from ipfs/docs/update-secio-config

docs: update config to indicate SECIO deprecation

docs/config.md

@@ -1255,7 +1255,7 @@ receiver supports. When establishing an _inbound_ connection, go-ipfs will let
 the initiator choose the protocol, but will refuse to use any of the disabled
 transports.
 
-Supported transports are: TLS (priority 100), SECIO (priority 200), Noise
+Supported transports are: TLS (priority 100), SECIO (Disabled: i.e. priority false), Noise
 (priority 300).
 
 No default priority will ever be less than 100.
@@ -1272,12 +1272,12 @@ Type: `priority`
 
 #### `Swarm.Transports.Security.SECIO`
 
-[SECIO](https://github.com/libp2p/specs/tree/master/secio) is the most widely
+[SECIO](https://github.com/libp2p/specs/tree/master/secio) was the most widely
 supported IPFS & libp2p security transport. However, it is currently being
 phased out in favor of more popular and better vetted protocols like TLS and
 Noise.
 
-Default: `200`
+Default: `false`
 
 Type: `priority`