docs: Fix DS_DEFAULT_ANALYZERS variable docs

What does this MR do and why?

Fixes DS_DEFAULT_ANALYZERS variable docs originally updated mistakenly in !85732 (merged).

DS_DEFAULT_ANALYZERS was deprecated in %14.0 NOT in %14.8 (replaced with DS_EXCLUDED_ANALYZERS) in issue #287691 (closed). It was removed in %15.0 in issue #333299 (closed).

Root cause would be addressed in the other MR !88133 (merged).

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