Update _index.md

Very quick fix.

Author: dmaier-redislabs

docs/stack/clients/om-clients/_index.md

@@ -13,4 +13,6 @@ You can use Redis OM with the following four programming languages:
 * [Node.js](/docs/connect/clients/om-clients/stack-node/)
 * [Python](/docs/connect/clients/om-clients/stack-python/)
 * [C# | .NET](/docs/connect/clients/om-clients/stack-dotnet/)
-* [Java | Spring](/docs/connect/clients/om-clients/stack-spring/)
+* [Java | Spring](/docs/connect/clients/om-clients/stack-spring/)
+
+<hr/>