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

Author: Cheukting

pandas/core/generic.py

@@ -3582,7 +3582,7 @@ def head(self, n=5):
         5  parrot
         6   shark
 
-        Viewing the last 5 lines (the default)
+        Viewing the first 5 lines (the default)
         >>> df.head()
            animal
         0    bear
@@ -3591,7 +3591,7 @@ def head(self, n=5):
         3    lion
         4  monkey
 
-        Viewing the last n lines (three in this case)
+        Viewing the first n lines (three in this case)
         >>> df.head(3)
            animal
         0    bear