Fix Typos and Update ROS 2 Jazzy Reference

[Prince25]

Description

This PR fixes minor typos and updates the ROS 2 version reference from Humble to Jazzy to match the jazzy branch.

Fixes #237 .

Changes Made

• Replaced ROS 2 Humble with ROS 2 Jazzy in the Prerequisites section.
• Updated the link to the ROS 2 Jazzy Installation Guide.
• Fixed broken markdown formatting in the irobot_create_msgs cloning instructions.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

No functional changes were made—only documentation updates. No additional testing required.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation