doc: Add examples for `build_with_hasher` method of cache builders#216

Merged

tatsuya6502 merged 3 commits intomaint-09from build-with-hasher-doc

Feb 1, 2023

+211-16

Commits on Feb 1, 2023

doc: Add examples for build_with_hasher method in cache builders
tatsuya6502
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CI: Avoid a strange crates.io index reading error from old Cargo
tatsuya6502
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CI: When testing MSRV, downgrade a dev-dependency ahash to v0.7.6
tatsuya6502
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