Rename the TOC title for 6.1

source/part2/chapter-06/index.rst

@@ -6,7 +6,7 @@
     :caption: Sections:
 
     nb/0-learning-objectives.ipynb
-    6.1 Representing geographic data in Python <nb/00-introduction-to-geographic-objects.ipynb>
+    6.1 Representing geographic data in vector format <nb/00-introduction-to-geographic-objects.ipynb>
     6.2 Introduction to geopandas GeoDataFrames <nb/01-geodataframe.ipynb>
     6.3 Common geometric operations <nb/02-geometric-operations.ipynb>
     6.4 Working with map projections <nb/03-coordinate-reference-system.ipynb>