DOC improve attributes and parameters descriptions in KernelPCA (#17747)
DOC improve attributes and parameters descriptions in KernelPCA (#17747)

Co-authored-by: Beatriz San Miguel <c0a49ad314277bae1dcf78f921359f6ea0b8687d@uk.fujitsu.com>
Co-authored-by: Loïc Estève <b4f57ceb208f2c5eae4e1192d707c3466a564837@ymail.com>
Co-authored-by: Guillaume Lemaitre <e5e78d384e205244ed69377c80930de68a2732ec@gmail.com>
Co-authored-by: Nicolas Hug <1a73af9e7ae00182733b2292511b814be66f065f@nicolas-hug.com>
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