Update Q_DataReduction.ipynb

Minor typo change

docs/notebooks/Q_DataReduction.ipynb

@@ -31,7 +31,7 @@
    "source": [
     "where the PSG is the same as before but the PSA is just the Mueller matrix for a quarter-wave plate. \n",
     "\n",
-    "From here, the data reduction process requires a combination of inputs from Q and the total intensity, I. If we only use one, we lose information about certain parts of the Mueller matrix. Specifically, measurements of I are accurate for the first row of the matrix and measurements of Q are good for the last three rows, so we use this combination of inputs to reconstruct the entire matrix. Thanfully, both Q and I can be found from a single set of images, so we only need an additional data reduction calculation to get the full matrix. Let's see how effective this is with a simulated matrix."
+    "From here, the data reduction process requires a combination of inputs from Q and the total intensity, I. If we only use one, we lose information about certain parts of the Mueller matrix. Specifically, measurements of I are accurate for the first row of the matrix and measurements of Q are good for the last three rows, so we use this combination of inputs to reconstruct the entire matrix. Thankfully, both Q and I can be found from a single set of images, so we only need an additional data reduction calculation to get the full matrix. Let's see how effective this is with a simulated matrix."
    ]
   },
   {