Fix FFDC plugin documentation

Changes:
     - Remove extraneous plugin entry in the
       documentation
Tested:
      - NA
Change-Id: Ifa1ca837b79d5d1b7d53a74db55be55922250660
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ffdc/docs/plugin.md b/ffdc/docs/plugin.md
index 0680ac2..fb81374 100644
--- a/ffdc/docs/plugin.md
+++ b/ffdc/docs/plugin.md
@@ -220,7 +220,6 @@
 
 ```
     - plugin:
-    - plugin:
       - plugin_name: plugin.ssh_execution
       - plugin_function: ssh_execute_cmd
       - plugin_args: