fix: address review comments

docs/usage/ls-coupling.ipynb

@@ -74,7 +74,7 @@
     "Imagine we have a two-body decay of $p_0\\rightarrow p_1p_2$. We denote the {attr}`.Spin.magnitude` of each particle $p_i$ as $s_i$ and their {attr}`~.Particle.parity` as $\\eta_i$. The values for $L$ and $S$ can now be determined as follows:\n",
     "\n",
     "1. Determine all values for $S$ that satisfy $\\left| s_1-s_2 \\right| \\le S \\le s_1+s_2$. The difference between each value for $S$ has to integer, so $S = \\left| s_1-s_2 \\right|, \\left| s_1-s_2 \\right|+1, \\dots, s_1+s_2$.\n",
-    "2. Determine all values for $L$ that satisfy $\\left| L-S \\right| \\le s_0 \\le L+S$, with $L$ a non-negative integer.\n",
+    "2. Determine all values for $L$ that satisfy $\\left| L-S \\right| \\le s_0 \\le L+S$, with $L$ being a non-negative integer.\n",
     "3. If there is parity conservation, $L$ has to satisfy an additional constraint: $\\eta_0 = \\eta_1\\cdot\\eta_2\\cdot(-1)^L$."
    ]
   },