Align JDK guidance with supported versions

[Shazaanashraff]

Purpose
Doc guidance still referenced legacy Java 7/8 behavior and file paths, which conflicts with the product’s JDK 21 baseline.

Goals
Align security configuration notes with JDK 21 behavior.
Remove outdated Java 7/8 build guidance for custom handlers.
Approach
Update JDK guidance to reflect modern defaults and correct java.security location, and update the custom handler build requirement to use a supported JDK.

User stories
As an APIM admin, I want docs that match the supported JDK so I can configure security correctly.

Release note
Align JDK guidance in security and custom handler docs with the supported JDK version.

Documentation
N/A (this PR is documentation)

Training
N/A

Certification
N/A (doc-only)

Marketing
N/A

Automation tests
Unit tests: Not run (doc-only)
Integration tests: Not run (doc-only)
Security checks
Followed secure coding standards? N/A (doc-only)
Ran FindSecurityBugs? N/A (doc-only)
No secrets committed? Yes
Samples
N/A

Related PRs
N/A

Migrations (if applicable)
N/A

Test environment
N/A (doc-only)

Learning
N/A

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 70371944-8b1c-428f-8a95-010ca601967b

📥 Commits

Reviewing files that changed from the base of the PR and between b8e0d5d and 65529d3.

📒 Files selected for processing (2)

• en/docs/install-and-setup/setup/security/configuring-transport-level-security.md
• en/docs/reference/customize-product/extending-api-manager/extending-gateway/writing-custom-handlers.md

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