markdown fix (#228)

Author: pmelchior

docs/0-quickstart.ipynb

@@ -163,12 +163,12 @@
     "\n",
     "But what's the point of the model frame? Why is it needed at all?\n",
     "\n",
-    "```{info}\n",
+    "```{tip}\n",
     "\n",
     "To fit multiple images with different PSF, different bands, different resolutions, etc..., we must define a model that is superior in all of these aspects, so that each observation can be computed from the model by a degradation operation, the so-called \"forward operator\". The point of joint modeling is to find one superior model of the sky that is consistent with all observations.\n",
     "```\n",
     "\n",
-    "In _scarlet2_, the forward operators are implemented as {py:class}`~scarlet2.renderer.Renderer`, which contains, e.g., PSF difference kernels and resampling transformations. It was created earlier by {py:func}`~scarlet2.Frame.from_observation`."
+    "In _scarlet2_, the forward operators are implemented as {py:class}`~scarlet2.renderer.Renderer`, which contains, e.g., PSF difference kernels and resampling transformations. It was created earlier by {py:func}`~scarlet2.Frame.from_observations`."
    ]
   },
   {