Neutral tone to docs

[laruizlo]

• Go over the documentation in each crate (all 18 below):
  • bouncycastle — umbrella crate (./Cargo.toml, src/)
  • cli — bc-rust binary (./cli)
  • bouncycastle-core — ./crypto/core
  • bouncycastle-core-test-framework — ./crypto/core-test-framework
  • bouncycastle-factory — ./crypto/factory
  • bouncycastle-base64 — ./crypto/base64
  • bouncycastle-hex — ./crypto/hex
  • bouncycastle-utils — ./crypto/utils
  • bouncycastle-sha2 — ./crypto/sha2
  • bouncycastle-sha3 — ./crypto/sha3
  • bouncycastle-hmac — ./crypto/hmac
  • bouncycastle-hkdf — ./crypto/hkdf
  • bouncycastle-rng — ./crypto/rng
  • bouncycastle-mlkem — ./crypto/mlkem
  • bouncycastle-mlkem-lowmemory — ./crypto/mlkem-lowmemory
  • bouncycastle-mldsa — ./crypto/mldsa
  • bouncycastle-mldsa-lowmemory — ./crypto/mldsa-lowmemory
  • mem_usage_benches — ./mem_usage_benches