Correct order of parameters in doc strings

[czgdp1807]

Description of the problem

As of now, the order of Parameters in docstrings of classes/functions doesn't align with the order required in their prototype. For example, TreeNode(key, data=None) then the order of parameters in doc strings should be,

Parameters
=========

key
...

data
...

and NOT,

Parameters
=========

data
...

key
...

All doc strings should be checked for this consistency for closing this issue.

Example of the problem

References/Other comments

[Amitsharma45]

can you explain this issue in detial

[Rukmini-Meda]

I would like to work on this issue. Please assign this to me as part of GSSoC'20.

[robotjellyzone]

Hi @Rukmini-Meda yes, you can work on this issue go ahead!