updated example

Author: RichRick1

examples/RG.ipynb

@@ -20,7 +20,7 @@
     "\\hat{H}_{B C S}=\\frac{1}{2} \\sum_{i=1}^N \\varepsilon_i\\left(a_{i \\uparrow}^{\\dagger} a_{1 \\uparrow}+a_{i \\downarrow}^{\\dagger} a_{i \\downarrow}\\right)-\\frac{g}{2} \\sum_{i, j=1}^N a_{i \\uparrow}^{\\dagger} a_{i \\downarrow}^{\\dagger} a_{j \\downarrow} a_{j \\uparrow}\n",
     "$$\n",
     "\n",
-    "This definition is given at a [paper](https://arxiv.org/pdf/2506.09379) and can be used to validate the numerical results that were kindly provided by the author."
+    "This definition is given in a [paper](https://arxiv.org/pdf/2506.09379) and can be used to validate numerical results that were kindly provided by [Paul Johnson](https://paul-a-johnson.fsg.ulaval.ca/en)."
    ]
   },
   {