Fix typo

lessons/03_wave/03_04_MUSCL.ipynb

@@ -153,7 +153,7 @@
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-      "Godunov proposed a first-order method in 1959 that uses the integral form of the conservation laws, Equation (1), and a piecewise constant representation of the solution, as shown in Figure (2). Notice that representing the solution in this way is like having a myriad little shocks at the cell boundaries (control surfaces).\n",
+      "Godunov proposed a first-order method in 1959 that uses the integral form of the conservation laws, Equation (1), and a piecewise constant representation of the solution, as shown in Figure (2). Notice that representing the solution in this way is like having a myriad of little shocks at the cell boundaries (control surfaces).\n",
       "\n",
       "For each control surface, we have *two values* for the solution $e$ at a given time: the constant value to the left, $e_L$, and the constant value to the right, $e_R$. A situation where you have a conservation law with a constant initial condition, except for a single jump discontinuity is called a **Riemann problem**. \n",
       "\n",
@@ -1477,4 +1477,4 @@
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  ]
-}
+}