[Edit] Java Substrings

[Radhika-okhade]

Description

Added new content

Issue Solved

#6571

Type of Change

• Editing an existing entry (fixing a typo, bug, issues, etc)
• Updating the documentation

Checklist

• [/ ] All writings are my own.
• [/ ] My entry follows the Codecademy Docs style guide.
• [/ ] My changes generate no new warnings.
• [ /] I have performed a self-review of my own writing and code.
• [ /] I have checked my entry and corrected any misspellings.
• [ /] I have made corresponding changes to the documentation if needed.
• [ /] I have confirmed my changes are not being pushed from my forked main branch.
• [ /] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [ /] I have linked any issues that are relevant to this PR in the Issues Solved section.

[VINAYKUMARGADDAM1411]

@Radhika-okhade i am intrested in taking this issue.

[dakshdeepHERE]

Fixed formatting errors, first person speech and minor grammar fixes. let's merge this.

[github-actions]

👋 @Radhika-okhade
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