correct typo in documentation demo notebook (#227)

* fix typo on image and notebook

* remove full stop after google colab button

* remove full stop in documentation notebook

docs/source/notebooks/DemoNotebook_ammico.ipynb

@@ -94,7 +94,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Import the ammico package."
+    "## Import the ammico package"
    ]
   },
   {