fix grammer; and add **make_addplot()** to TODO list

examples/marketcolor_overrides.ipynb

@@ -357,7 +357,7 @@
     "1. It helps ensure that your marketcolor overrides are the same length as your dataframe, and\n",
     "2. It allows you to use the dataframe's `DatetimeIndex` in order to position the override values.\n",
     "\n",
-    "#### Note that you will still have to pass the `marketcolor_overrides` as an separate iterable (apart from the dataframe)."
+    "#### Note that you will still have to pass the `marketcolor_overrides` as a separate iterable (apart from the dataframe)."
    ]
   },
   {
@@ -787,8 +787,9 @@
    "source": [
     "### TO DO:\n",
     "1. `marketcolor_overrides` should affect volume *when the override is a marketcolor object* that includes a 'volume' key.\n",
-    "2. support \"hollow and filled\" candles.\n",
-    "3. support renko and point-and-figure.  This may be tricky (since one \"box\" may cover more and/or less than one date).  Also, is support for marketcolor overrides even needed for renko and pnf? (find out from those who commonly use them)."
+    "2. support `marketcolor_overrides` in **`mpf.make_addplot()`**\n",
+    "3. support \"hollow and filled\" candles (both `mpf.plot()` and `mpf.make_addplot()`).\n",
+    "4. support renko and point-and-figure.  This may be tricky (since one \"box\" may cover more and/or less than one date).  Also, is support for marketcolor overrides even needed for renko and pnf? (find out from those who commonly use them)."
    ]
   },
   {