add import

Author: jph00

nbs/explanations/config.ipynb

@@ -18,6 +18,7 @@
    "source": [
     "#| hide\n",
     "from fastcore.utils import *\n",
+    "from fastcore.docments import *\n",
     "from nbdev.config import *\n",
     "\n",
     "from nbdev.showdoc import *"