#361 Issue: Update SetLatencyAndJitter func of Go doc

[charans29]

Overview

This pull request updates the documentation for the SetLatencyAndJitter function in the knuu package. The previous documentation was outdated and misleading, indicating that only one traffic shaping rule could be set at a time and the function could only be called in the 'Committed' state. However, with the current BitTwister integration, these limitations have been removed.

The updates include:

• Clarifying that multiple traffic shaping rules such as latency and jitter can now be set simultaneously.
• Specifying that the function can only be called when the instance is in the 'Started' state.

These changes ensure that the documentation accurately reflects the current capabilities and usage requirements of the SetLatencyAndJitter function.