fixing a typo in the docs and adding reference to joss figure

docs/tutorials/data-and-models.md

@@ -104,7 +104,7 @@ In the following sections, we will go through some of the specific ways that you
 
 ## Orbital conventions
 
-These orbits are specified specified with respect to a single central body (generally the most massive body) and then a system of non-interacting bodies orbiting the central.
+These orbits are specified with respect to a single central body (generally the most massive body) and then a system of non-interacting bodies orbiting the central.
 This is a good parameterization for exoplanetary systems and binary stars, but it is sometimes not sufficient for systems with multiple massive bodies where the interactions will be important to the dynamics.
 
 We follow a set of internally consistent orbital conventions that also attempts to respect as many of the established conventions of the stellar and exoplanetary fields as possible.

joss/paper.md

@@ -181,7 +181,9 @@ detailed example use cases for `exoplanet` and the other libraries described
 here. Like the tutorials on the documentation page, these case studies are
 automatically executed using GitHub Actions, but at lower cadence (once a week
 and when a new release of the `exoplanet` library is made) since the runtime is
-much longer.
+much longer. \autoref{fig:figure} shows the results of two example case studies
+demonstrating some of the potential use cases of the `exoplanet` software
+ecosystem.
 
 ![Some examples of datasets fit using `exoplanet`. The full analyses behind
 these examples are available on the "Case Studies" page as Jupyter notebooks.