DOC: update pandas.DataFrame.head docstring (#20262)

Author: thismakessand

pandas/core/generic.py

@@ -3607,8 +3607,8 @@ def head(self, n=5):
         """
         Return the first `n` rows.
 
-        This function returns the first `n` rows for the object based on the
-        underlying index. It is useful for quickly testing if your object
+        This function returns the first `n` rows for the object based
+        on position. It is useful for quickly testing if your object
         has the right type of data in it.
 
         Parameters
@@ -3619,7 +3619,7 @@ def head(self, n=5):
         Returns
         -------
         obj_head : type of caller
-            The first n rows of the caller object.
+            The first `n` rows of the caller object.
 
         See Also
         --------
@@ -3651,7 +3651,7 @@ def head(self, n=5):
         3       lion
         4     monkey
 
-        Viewing the first n lines (three in this case)
+        Viewing the first `n` lines (three in this case)
 
         >>> df.head(3)
               animal