Remove timeout parameter from plugin script docs

Support for this parameter was removed but the docs were not
updated. This commit removes this stale parameter from the docs.

Relates #21068

docs/plugins/plugin-script.asciidoc

@@ -141,25 +141,6 @@ sudo bin/elasticsearch-plugin -Epath.conf=/path/to/custom/config/dir install <pl
 You can also set the `CONF_DIR` environment variable to the custom config
 directory path.
 
-[float]
-=== Timeout settings
-
-By default, the `plugin` script will wait indefinitely when downloading before
-failing. The timeout parameter can be used to explicitly specify how long it
-waits. Here is some examples of setting it to different values:
-
-[source,shell]
------------------------------------
-# Wait for 30 seconds before failing
-sudo bin/elasticsearch-plugin install analysis-icu --timeout 30s
-
-# Wait for 1 minute before failing
-sudo bin/elasticsearch-plugin install analysis-icu --timeout 1m
-
-# Wait forever (default)
-sudo bin/elasticsearch-plugin install analysis-icu --timeout 0
------------------------------------
-
 [float]
 === Proxy settings