Minor fixes

debug/hough_opencv.py

@@ -1,7 +1,7 @@
 """
 usage: python hough_opencv.py file.png
 
-find lines present in an image using opencv's hough transform.
+finds lines present in an image using opencv's hough transform.
 """
 
 import sys

debug/hough_skimage.py

@@ -1,7 +1,7 @@
 """
 usage: python hough_skimage.py file.png
 
-find lines present in an image using scikit-image's hough transform.
+finds lines present in an image using scikit-image's hough transform.
 """
 
 import sys

debug/houghp_skimage.py

@@ -1,7 +1,7 @@
 """
 usage: python hough_prob.py file.png
 
-find lines present in an image using scikit-image's hough transform.
+finds lines present in an image using scikit-image's hough transform.
 """
 
 import sys

debug/morph_transform.py

@@ -1,7 +1,7 @@
 """
 usage: python morph_transform.py file.png
 
-find lines present in an image using opencv's morph transform.
+finds lines present in an image using opencv's morph transform.
 """
 
 import sys

debug/plot_geo.py

@@ -2,7 +2,7 @@
 usage:  python plot_geo.py file.pdf
         python plot_geo.py file.pdf file.png
 
-print lines and rectangles present in a pdf file.
+prints lines and rectangles present in a pdf file.
 """
 
 import sys