[clang] [clang-tools-extra] [analyzer][clang-tidy][NFC] Clean up eagerly-assume handling (PR #112209)

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https://github.com/isuckatcs commented:

LGTM apart from some typos.

Maybe we also want to add the unary negation part to the documentation of `ShouldEagerlyAssume` in `AnalyzerOptions.def`.

https://github.com/llvm/llvm-project/pull/112209