docs: clarify mfs total size caveat

public/locales/en/files.json

@@ -115,8 +115,8 @@
   "clickToCancel": "Click to cancel",
   "blocks": "Blocks",
   "allBlocks": "All blocks",
-  "allBlocksDescription": "Total size of blocks on your entire IPFS node; this includes everything in Files, plus all locally pinned items and any temporary cached data",
-  "filesDescription": "Total size of data in the current directory (if a subdirectory, the size of all data in Files is also displayed)",
+  "allBlocksDescription": "Total size of blocks on your entire IPFS node; this includes everything in Files view (MFS), plus any additional low-level pins and any temporary cached blocks that were not garbage-collected yet.",
+  "filesDescription": "Total size of data in the current directory (if a subdirectory, the size of all data in Files view (MFS) is also displayed). If you have a big directory that is only partially fetched, a total size listed here could be bigger than your local repository.",
   "pinningQueue": "Pinning queue",
   "more": "More",
   "files": "Files",