man: dockerd: add description for --log-format option

This option was added in a08abec9f8d59eaa44c375900e254384a68c5a31,
as part of Docker v25.0, but did not update the docs and manpage.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

man/dockerd.8.md

@@ -52,6 +52,7 @@ dockerd - Enable daemon mode
 [**--label**[=*[]*]]
 [**--live-restore**[=**false**]]
 [**--log-driver**[=*json-file*]]
+[**--log-format**="*text*|*json*"]
 [**--log-opt**[=*map[]*]]
 [**--mtu**[=*0*]]
 [**--max-concurrent-downloads**[=*3*]]
@@ -324,6 +325,9 @@ unix://[/path/to/socket] to use.
   Default driver for container logs. Default is **json-file**.
   **Warning**: **docker logs** command works only for **json-file** logging driver.
 
+**--log-format**="*text*|*json*"
+  Set the format for logs produced by the daemon. Default is "text".
+
 **--log-opt**=[]
   Logging driver specific options.