Fix markdown in fwd mvi example

notebooks/04-magnetics/fwd_magnetics_mvi_3d.ipynb

@@ -401,10 +401,10 @@
     "As a result, **magnetic vector models in SimPEG are defined using SI units**.\n",
     "To create a magnetic vector model, we must\n",
     "\n",
-    "1) Compute the induced magnetization vector for each cell by multiplying the susceptibility $\\chi$ by the inducing magnetic field intensity $\\vec{H}_0$.\n",
-    "2) Define the remanent magnetization vector for each cell.\n",
+    "1) Compute the induced magnetization vector for each cell by multiplying the susceptibility $\\chi$ by the inducing magnetic field intensity $\\vec{H}_0$. The resulting quantity has units A/m.\n",
+    "2) Define the remanent magnetization vector for each cell, once again in A/m.\n",
     "3) Sum the induced and remanent contributions.\n",
-    "4) Normalize by the amplitude of inducing magnetic field intensity; i.e. $\\left | \\vec{H}_0 \\right |$ in units A/m. The resulting quantity \n",
+    "4) Normalize by the amplitude of inducing magnetic field intensity; i.e. $\\left | \\vec{H}_0 \\right |$ in units A/m. The resulting quantity is unitless (SI).\n",
     "5) Re-organize the quantity as a 1D [numpy.ndarray](myst:numpy#numpy.ndarray) organized by vector component; i.e. np.r_[chi_1, chi_2, chi_3]\n",
     "\n",
     "Here, the model consists of a susceptible and remanently magnetized sphere within a negligibly susceptible host. The horizontal components of the induced and remanent magnetization has been balance so that they cancel out, and the net magnetization is downward. We plot the magnetic vector models using the [plot_slice](myst:discretize#discretize.TreeMesh.plot_slice) method."