Remove some TODOs (#6488)

* Remove stale TODOs

* Ban TODO markers from markdown

* Scrub all TODOs from ci/ and book/

ci/publish-crate.sh

@@ -50,8 +50,8 @@ for Cargo_toml in $Cargo_tomls; do
   (
     set -x
     crate=$(dirname "$Cargo_toml")
-    # TODO: the rocksdb package does not build with the stock rust docker image,
-    # so use the solana rust docker image until this is resolved upstream
+    # The rocksdb package does not build with the stock rust docker image so use
+    # the solana rust docker image
     cargoCommand="cargo publish --token $CRATES_IO_TOKEN"
     ci/docker-run.sh "$rust_stable_docker_image" bash -exc "cd $crate; $cargoCommand"
   ) || true # <-- Don't fail.  We want to be able to retry the job in cases when a publish fails halfway due to network/cloud issues