Correct the "Update the Java Agent" instructions

[kford-newrelic]

Description

The current documentation for updating the Java Agent are incorrect. Step 3 references extracting the newrelic-api-.jar file but for customers that are using the API artifact, they will get this by updating their dependencies.

Acceptance Criteria

• Modify Step 3 to remove the reference to the newrelic-api.jar file
• Add a new step to reference the newrelic-api.jar file and that customers would need to update their dependencies (should we explicitly reference Maven?)
• Closely review the remaining content on the page - any other updates or clarifications should be included?

Design Consideration/Limitations

N/A

Dependencies

N/A

Additional context

N/A

[workato-integration[bot]]

https://new-relic.atlassian.net/browse/NR-253798

[obenkenobi]

I believe referencing maven may be best.