Update README.md

Author: BeaMarton13

doc/source/community_detection_guide/networks/README.md

@@ -15,7 +15,9 @@ This data is licensed under a **Creative Commons Attribution-NonCommercial-Share
 This file was built based on the following CSV file:
 https://raw.githubusercontent.com/mathbeveridge/gameofthrones/master/data/got-s1-edges.csv
 
-
+---
+---
+---
 
 ### README for `lesmis/lesmis.gml`
 
@@ -33,4 +35,4 @@ When using this data, please cite the following work:
 ### Source
 
 This file was obtained from Mark Newman's repository of network datasets at the University of Michigan, located at the following URL:
-https://websites.umich.edu/~mejn/netdata/
+https://websites.umich.edu/~mejn/netdata/