Fix typo in sample gerrit.config

Fix typo in the gerrit.config (missing '=') so that
first-time users can have a smoother out-of-the-box
experience by just copying&pasting the sample

Change-Id: If5dac8c5b74dade2d13f528e831c07fb838eadda
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index c23f1bd..f612339 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -7,7 +7,7 @@
 ```
 [plugin "@PLUGIN@"]
   connectionTimeout = 3000
-  socketTimeout 2500
+  socketTimeout = 2500
   maxTries = 300
   retryInterval = 2000
   threadPoolSize = 3