add transpose in markdown comment

examples/kalman_filter.ipynb

@@ -207,7 +207,7 @@
     "\n",
     "Note how we use `equinox` to combine the Kalman-Filter logic in `__call__` and the Kalman-Filter parameters $Q$ , $R$ in one object.\n",
     "\n",
-    "The matrices $Q$ and $R$ must be positive-definite. To ensure that this property always holds, we fit a matrices $Q'$ and $R'$ instead, and obtain $Q$ and $R$ from their matrix-matrix products. (I.e. $Q = Q' \\cdot Q'$, with $Q'$ square.)"
+    "The matrices $Q$ and $R$ must be positive-definite. To ensure that this property always holds, we fit a matrices $Q'$ and $R'$ instead, and obtain $Q$ and $R$ from their matrix-matrix products. (I.e. $Q = Q'^T \\cdot Q'$, with $Q'$ square.)"
    ]
   },
   {