Cargo.toml: Cross-reference composefs-rs crates with docs

Add a comment noting that changes to the composefs-rs crate list should
also update the documentation files that reference them.

Assisted-by: OpenCode (Opus 4.5)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

Cargo.toml

@@ -40,7 +40,8 @@ cfg-if = "1.0"
 chrono = { version = "0.4.38", default-features = false }
 clap = "4.5.4"
 clap_mangen = { version = "0.2.20" }
-# Reviewers (including AI tools): This hash is duplicated as there's not a much better way to handle it right now
+# Reviewers (including AI tools): The composefs-rs git revision is duplicated for each crate.
+# If adding/removing crates here, also update docs/Dockerfile.mdbook and docs/src/internals.md.
 composefs = { git = "https://github.com/containers/composefs-rs", rev = "1498349e11d0e4bd545feab533f0b7ab5294ae9a", package = "composefs", features = ["rhel9"] }
 composefs-boot = { git = "https://github.com/containers/composefs-rs", rev = "1498349e11d0e4bd545feab533f0b7ab5294ae9a", package = "composefs-boot" }
 composefs-oci = { git = "https://github.com/containers/composefs-rs", rev = "1498349e11d0e4bd545feab533f0b7ab5294ae9a", package = "composefs-oci" }