Documentation: Add `ssl_context` option to `RedisCluster` documentation #570

Job	Run time
ci / Generate job matrix	8s
ci / QA Checks (Documentation Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integra...	22s
ci / QA Checks (MkDocs Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-ac...	24s
ci / QA Checks (README Linting [8.1, locked], ubuntu-latest, laminas/laminas-continuous-integration-ac...	28s
	1m 22s

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