Small tweak, update changelog.

bluescarni · Jan 13, 2024 · e881120 · e881120
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diff --git a/doc/changelog.rst b/doc/changelog.rst
@@ -9,6 +9,8 @@ Changelog
 New
 ~~~
 
+- Add new example on gravity-gradient stabilisation
+  (`#159 <https://github.com/bluescarni/heyoka.py/pull/159>`__).
 - Add support for Lagrangian and Hamiltonian mechanics
   (`#156 <https://github.com/bluescarni/heyoka.py/pull/156>`__).
 - It is now possible to pass a list of step callbacks to the

diff --git a/doc/notebooks/gg_stab.ipynb b/doc/notebooks/gg_stab.ipynb
@@ -11,7 +11,7 @@
     "model of [gravity-gradient stabilization](https://en.wikipedia.org/wiki/Gravity-gradient_stabilization) for a spacecraft orbiting\n",
     "the Earth. The setup is inspired by [this paper](https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/APL-V03-N05/APL-03-05-Fischell.pdf).\n",
     "\n",
-    "Gravity-gradient stabilization is a technique to passively stabilize the attitude of a satellite exploiting the Earth's gravity gradient.\n",
+    "Gravity-gradient stabilization is a technique to passively stabilize the attitude of a satellite by exploiting the Earth's gravity gradient.\n",
     "Consider a simple dumbbell-shaped satellite orbiting the Earth on a circular Keplerian orbit:\n",
     "\n",
     "<img src=\"ggrad1.svg\" width=\"600\">\n",
@@ -262,7 +262,7 @@
    "id": "0aa6d4b5",
    "metadata": {},
    "source": [
-    "[Theoretical considerations](https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/APL-V03-N05/APL-03-05-Fischell.pdf) indicate that, in this setup, the dumbbell is expected to oscillate along the vertical direction with an amplitude of circa $36^\\degree$. Let us check by computing the difference between $\\theta$ and the angular coordinate $\\phi=\\arctan\\left( \\frac{y_1}{x_1} \\right)$:"
+    "[Theoretical considerations](https://secwww.jhuapl.edu/techdigest/Content/techdigest/pdf/APL-V03-N05/APL-03-05-Fischell.pdf) indicate that, in this setup, the dumbbell is expected to oscillate along the vertical direction with an amplitude of circa $36^\\circ$. Let us check by computing the difference between $\\theta$ and the angular coordinate $\\phi=\\arctan\\left( \\frac{y_1}{x_1} \\right)$:"
    ]
   },
   {