improvements based on core-mans suggestion

Author: michaelgrund

pygmt/__init__.py

@@ -9,8 +9,8 @@
 Here are just a few of the things that PyGMT does well:
   - Easy handling of all kinds of geospatial data including gridded and
     raster data.
-  - Allows plotting of a large spectrum of objects on maps including lines,
-    vectors, polygons, and symbols (pre-defined and customized)
+  - Allows plotting of a large spectrum of objects on figures including
+    lines, vectors, polygons, and symbols (pre-defined and customized)
 """
 
 import atexit as _atexit