Cleanup docs on reading shape files to avoid user confusion (#783)

* Have docs on reading shape files show a standard path

The docs showed reading a file from a tmpdir using the previous
generation of format strings. This is confusing to users (see #781).

Fixes #781

* Remove local shell command; just show csv contents

OS specific shell commands with local path information can be confusing
to users. This removes that command the just shows the output (the
structure of the csv file) which is all the user needs to understand
the behavior of the documented functions.

docs/getting_started/Reading_and_Writing.md

@@ -13,8 +13,8 @@ DeepForest was originally designed for bounding box annotations. As of DeepFores
 #### CSV
 
 Here the annotations are in plain csv files, with coordinates relative to image origin.
+
 ```
-(DeepForest) (base) benweinstein@Bens-MacBook-Pro data % cat OSBS_029.csv
 image_path,xmin,ymin,xmax,ymax,label
 OSBS_029.tif,203,67,227,90,Tree
 OSBS_029.tif,256,99,288,140,Tree
@@ -25,6 +25,7 @@ OSBS_029.tif,365,21,400,70,Tree
 OSBS_029.tif,278,1,312,37,Tree
 OSBS_029.tif,364,204,400,246,Tree
 ```
+
 ```
 filename = get_data("OSBS_029.csv")
 utilities.read_file(filename)
@@ -52,7 +53,7 @@ Name: 0, dtype: object
 These coordinates are made relative to the image origin when the file is read.
 
 ```
-shp = utilities.read_file(input="{}/test_read_file_boxes_projected.shp".format(tmpdir))
+shp = utilities.read_file(input="/path/to/boxes_shapefile.shp")
 shp.head()
   label    image_path                                           geometry
 0  Tree  OSBS_029.tif  POLYGON ((105.000 214.000, 95.000 214.000, 95....
@@ -71,7 +72,7 @@ x,y,label
 
 ### Shapefile
 ```
-annotations = utilities.read_file(input="{}/test_read_file_points_projected.shp".format(tmpdir))
+shp = utilities.read_file(input="/path/to/points_shapefile.shp")
 annotations.head()
   label    image_path                 geometry
 0  Tree  OSBS_029.tif  POINT (100.000 209.000)
@@ -90,8 +91,9 @@ Polygons are expressed well-known-text format. Learn more about (wkt)[https://en
 ```
 
 ## Shapefile
+
 ```
-annotations = utilities.read_file(input="{}/test_read_file_polygons_unprojected.shp".format(tmpdir))
+shp = utilities.read_file(input="/path/to/polygons_shapefile.shp")
 annotations.head()
   label    image_path                                           geometry
 0  Tree  OSBS_029.png  POLYGON ((0.00000 0.00000, 0.00000 2.00000, 1....