Misc. typo fixes (followup to #10935)

some trivial missed typos from the previous PR

docs/source/whatsnew/github-stats-1.0.rst

@@ -848,7 +848,7 b' Pull Requests (793):'
 * :ghpull:`2941`: fix baseUrl
 * :ghpull:`2903`: Specify toggle value on cell line number
 * :ghpull:`2911`: display order in output area configurable
-* :ghpull:`2897`: Dont rely on BaseProjectUrl data in body tag
+* :ghpull:`2897`: Don't rely on BaseProjectUrl data in body tag
 * :ghpull:`2894`: Cm configurable
 * :ghpull:`2927`: next release will be 1.0
 * :ghpull:`2932`: Simplify using notebook static files from external code

examples/IPython Kernel/Custom Display Logic.ipynb

@@ -777,7 +777,7 b''
     }
    ],
    "source": [
-    "# that is deffinitively wrong as it should show the PNG. \n",
+    "# that is definitively wrong as it should show the PNG. \n",
     "display(Gaussian())"
    ]
   },

examples/IPython Kernel/Rich Output.ipynb

@@ -660,7 +660,7 b''
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Here is the embedded version. Note that this image was pulled from the webcam when this code cell was originally run and stored in the Notebook. Unless we rerun this cell, this is not todays image."
+    "Here is the embedded version. Note that this image was pulled from the webcam when this code cell was originally run and stored in the Notebook. Unless we rerun this cell, this is not today's image."
    ]
   },
   {