style: comment about where to find more oci image details if we need them

Author: stevebillings

src/main/java/com/synopsys/integration/blackduck/imageinspector/image/oci/OciImageDirectoryExtractor.java

@@ -91,7 +91,8 @@ public FullLayerMapping getLayerMapping(final File imageDir, @Nullable String gi
 
         OciImageManifest imageManifest = gson.fromJson(manifestFileText, OciImageManifest.class);
 
-
+        // If we ever need more detail (os/architecture, history, cmd, etc):
+        // imageManifest.config.digest has the filename (in the blobs dir) of the file that has that detail
         String pathToImageConfigFileFromRoot = findImageConfigFilePath(imageManifest);
         List<String> layerInternalIds = imageManifest.getLayers().stream()
                                             .map(OciDescriptor::getDigest)