DOC: Adding example and See also to head and tail method (pandas-dev#16416)

Author: Cheukting

pandas/core/generic.py

@@ -3585,6 +3585,7 @@ def head(self, n=5):
         8      zebra
 
         Viewing the first 5 lines
+
         >>> df.head()
               animal
         0  alligator
@@ -3594,6 +3595,7 @@ def head(self, n=5):
         4     monkey
 
         Viewing the first n lines (three in this case)
+
         >>> df.head(3)
               animal
         0  alligator
@@ -3638,6 +3640,7 @@ def tail(self, n=5):
         8      zebra
 
         Viewing the last 5 lines
+
         >>> df.tail()
            animal
         4  monkey
@@ -3647,6 +3650,7 @@ def tail(self, n=5):
         8   zebra
 
         Viewing the last n lines (three in this case)
+
         >>> df.tail(3)
           animal
         6  shark