Rewor and clean

clean/01_intro.ipynb

@@ -1084,7 +1084,7 @@
     "learn.fine_tune(4, 1e-2)\n",
     "```\n",
     "\n",
-    "This reduces the batch size to 32 (we will explain this later). If you keep hitting the same error, change 32 by 16."
+    "This reduces the batch size to 32 (we will explain this later). If you keep hitting the same error, change 32 to 16."
    ]
   },
   {
@@ -1121,7 +1121,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Sidebar: The order matter"
+    "### Sidebar: The order matters"
    ]
   },
   {