[Edit] Java: .substring()

[codecademy-docs]

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We would like to edit the .substring() term entry in Java. The entry lives in content/java/concepts/strings/terms/substring/substring.md.

Please refer to the term entry template, content standards, and markdown style guide when working on the PR for this issue.

Please:

• Add advantages and use cases
• Add best practices and/or a FAQ section

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