modify Moharam's derivation part

Author: yonghakim

notebooks/RCWA/RCWA_derivation.ipynb

@@ -154,7 +154,10 @@
   {
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     "# Potential Failure Case in RCWA with Scattering Matrices\n",
@@ -201,15 +204,6 @@
     "\n",
     "This problem is not just for gap media, but also if any of the layers or reflection/transmission regions have such properties...As a result, it isn't obvious to me that scattering matrix formalism is 'unconditionally stable'"
    ]
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