lower case pandas

samples/core/tutorials/estimators/linear.ipynb

@@ -416,7 +416,7 @@
       },
       "cell_type": "markdown",
       "source": [
-        "[Pandas](https://pandas.pydata.org/) provides some convenient utilities for data analysis. Here's a list of columns available in the Census Income dataset:"
+        "[pandas](https://pandas.pydata.org/) provides some convenient utilities for data analysis. Here's a list of columns available in the Census Income dataset:"
       ]
     },
     {