fix readme

Author: mgeplf

README.rst

@@ -355,18 +355,18 @@ The command outputs the density files in the output-dir and a metadata json file
 
 .. code-block:: json
 
-{
-    "SLAC": {
-        "bNAC": "data/ccfv2/test_regions_me-types/SLAC|bNAC_densities.nrrd",
-        "cAC": "data/ccfv2/test_regions_me-types/SLAC|cAC_densities.nrrd",
-        "cNAC": "data/ccfv2/test_regions_me-types/SLAC|cNAC_densities.nrrd"
-    },
-    "NGC-SA": {
-        "cNAC": "data/ccfv2/test_regions_me-types/NGC-SA|cNAC_densities.nrrd",
+    {
+        "SLAC": {
+            "bNAC": "data/ccfv2/test_regions_me-types/SLAC|bNAC_densities.nrrd",
+            "cAC": "data/ccfv2/test_regions_me-types/SLAC|cAC_densities.nrrd",
+            "cNAC": "data/ccfv2/test_regions_me-types/SLAC|cNAC_densities.nrrd"
+        },
+        "NGC-SA": {
+            "cNAC": "data/ccfv2/test_regions_me-types/NGC-SA|cNAC_densities.nrrd",
+            ...
+        },
         ...
-    },
-    ...
-}
+    }
 
 Subdivide excitatory files into pyramidal subtypes
 --------------------------------------------------