Fixed typo

Changed locators to locator in command example.
diff --git a/lucene/README.md b/lucene/README.md
index 77aa0c2..2bc6918 100644
--- a/lucene/README.md
+++ b/lucene/README.md
@@ -51,7 +51,7 @@
 
         $ gfsh
         ...
-        gfsh>connect --locators=localhost[10334]
+        gfsh>connect --locator=localhost[10334]
         gfsh>query --query="select * from /example-region"
         ...