Fix indentation

Author: lcawl

specification/_global/exists/examples/xCodeSamples/DocumentExistsRubyExample1.yaml

@@ -1,8 +1,8 @@
-- lang: Ruby
-  # label:
-  source: |
-    response = client.exists(
-      index: 'my-index-000001',
-      id: 0
-    )
-    puts response
+lang: Ruby
+# label:
+source: |
+  response = client.exists(
+    index: 'my-index-000001',
+    id: 0
+  )
+  puts response