[hotfix] Fix indentation in config.toml
diff --git a/docs/config.toml b/docs/config.toml
index a0c74dc..467eebd 100644
--- a/docs/config.toml
+++ b/docs/config.toml
@@ -61,10 +61,10 @@
   ]
 
   PreviousDocs = [
-  	["3.0", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-3.0"],
-  	["2.2", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.2"],
+    ["3.0", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-3.0"],
+    ["2.2", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.2"],
     ["2.1", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.1"],
-	  ["2.0", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.2"]
+    ["2.0", "https://ci.apache.org/projects/flink/flink-statefun-docs-release-2.2"]
   ]
 
 [markup]