[DOCS] Fix intro sentence for Docker install instructions (#83939) (#84822)

Fixes an intro sentence for the Docker install instructions.

Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
(cherry picked from commit 472a7d8e914702e4d77e6c7c5b99d8148c9b602c)

Co-authored-by: Alexander Reelsen <alexander@reelsen.net>

docs/reference/setup/install/docker.asciidoc

@@ -72,7 +72,7 @@ token, which is valid for 30 minutes. This token automatically applies the
 security settings from your {es} cluster, authenticates to {es} with the
 `kibana_system` user, and writes the security configuration to `kibana.yml`.
 
-The following command starts a single-node {es} cluster for development or
+The following commands start a single-node {es} cluster for development or
 testing.
 
 . Create a new docker network for {es} and {kib}