Update docs/declare_masking_rules.md, docs/masking_functions.md,...

Mahesh Motururequested to merge
moturu1/postgresql_anonymizer:moturu1-master-patch-31691 into master

Update docs/declare_masking_rules.md, docs/masking_functions.md, docs/generalization.md, docs/detection.md, docs/custom_fake_data.md

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