Remove OracleLobHandler from documentation [SPR-14809]

[spring-projects-issues]

Philippe Marschall opened SPR-14809 and commented

Now that OracleLobHandler has finally been removed it should also be removed from the documentation.

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Referenced from: pull request #1204, and commits 6fb4352, eee742d

[spring-projects-issues]

Stéphane Nicoll commented

Thanks for the PR!