docs: Avoid legality confusion over syntax error in JSON example

The illegality is the nesting, not the syntax error, so lets fix the
syntax.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Icf2d7f27e7b7cce7595a175c14dea2263841ddc8
diff --git a/docs/EntityManagerDbusAPI.md b/docs/EntityManagerDbusAPI.md
index 268db09..a7ffabd 100644
--- a/docs/EntityManagerDbusAPI.md
+++ b/docs/EntityManagerDbusAPI.md
@@ -127,6 +127,7 @@
             "key: {
                 "key2": "value"
             }
+        }
     }
 ]