8365198: Remove unnecessary mention of finalize in ImageIO reader/writer docs

[prrace]

Image I/O's ImageReader and ImageWriter have never had finalize() methods, yet have a gratuitous mention of finalize(). This should be removed. Simple doc only change

CSR for review : https://bugs.openjdk.org/browse/JDK-8365410

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
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• Commit message must refer to an issue
• Change requires CSR request JDK-8365410 to be approved

Issues

• JDK-8365198: Remove unnecessary mention of finalize in ImageIO reader/writer docs (Bug - P4)
• JDK-8365410: Remove unnecessary mention of finalize in ImageIO reader/writer docs (CSR)

Reviewers

• Brent Christian (@bchristi-git - Reviewer)

Reviewing

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