Fix doc build with --all-features (#8277)

* implement

* make default pre/post_upgrade

* simplify Cargo.toml

* revert removal of outdated/private links

* link in pallet-mmr

substrate/client/tracing/src/logging/layers/prefix_layer.rs

@@ -23,7 +23,7 @@ use tracing_subscriber::{layer::Context, registry::LookupSpan, Layer};
 pub const PREFIX_LOG_SPAN: &str = "substrate-log-prefix";
 
 /// A `Layer` that captures the prefix span ([`PREFIX_LOG_SPAN`]) which is then used by
-/// [`EventFormat`] to prefix the log lines by customizable string.
+/// [`crate::logging::EventFormat`] to prefix the log lines by customizable string.
 ///
 /// See the macro `sc_cli::prefix_logs_with!` for more details.
 pub struct PrefixLayer;