Image in Fairness_Indicators_Lineage_Case_Study.ipynb is not publicly accessible

[BioGeek]

URL with the issue:

https://github.com/tensorflow/fairness-indicators/blob/master/g3doc/tutorials/Fairness_Indicators_Lineage_Case_Study.ipynb

Description of issue (what needs changing):

The link to the image on line 899 in the notebook is not publicly accessible, you need to sign in with a Google account to view it.

        "![Type I and Type II errors](http://services.google.com/fh/gumdrop/preview/blogs/type_i_type_ii.png)\n",

Correct links

Link to a publicly accessible type_i_type_ii.png.