Fix autoware_pose_covariance_modifier_node flowchart

[meliketanrikulu]

Checklist

• [X] I've read the contribution guidelines.
• [X] I've searched other issues and no duplicate issues were found.
• [X] I've agreed with the maintainers that I can plan this task.

Description

The autoware pose covariance modifier flowchart was corrupted while transferring it to the documentation. The same flowchart in the README should appear in the documentation. Flowchart in the documentation: https://autowarefoundation.github.io/autoware.universe/main/localization/autoware_pose_covariance_modifier/#with-this-package Flowchart in the README.md : https://github.com/autowarefoundation/autoware.universe/tree/main/localization/autoware_pose_covariance_modifier#with-this-package

Purpose

Correcting the flowchart to make the documentation clear

Possible approaches

I have no idea at this point what's causing it.

Definition of done

This task is completed by ensuring that the flowchart in the documentation is the same as in README.md.