concept: don't emphasize cache structure is flat

per #2075 (review)

content/docs/user-guide/basic-concepts/dvc-cache.md

@@ -4,6 +4,6 @@ match: ['DVC cache', cache, caches, cached, 'cache directory']
 ---
 
 The DVC cache is a hidden storage (by default in `.dvc/cache`) for files and
-directories tracked by DVC, and their different versions. Data is cached into a
-special flattened
-[structure](/doc/user-guide/dvc-files-and-directories#structure-of-the-cache-directory).
+directories tracked by DVC, and their different versions. Learn more about it's
+structure
+[here](/doc/user-guide/dvc-files-and-directories#structure-of-the-cache-directory).