Revert "Hide unstable `orchard` feature flag in rustdoc"

Now that the release commits are created, we can unhide this ahead of
the subsequent Orchard-supporting releases.

This reverts commit zcash/librustzcash@6161709441.

zcash_client_backend/Cargo.toml

@@ -110,8 +110,6 @@ zcash_keys = { workspace = true, features = ["test-dependencies"] }
 time = ">=0.3.22, <0.3.24" # time 0.3.24 has MSRV 1.67
 
 [features]
-orchard = ["dep:orchard", "zcash_keys/orchard"]
-
 ## Enables the `tonic` gRPC client bindings for connecting to a `lightwalletd` server.
 lightwalletd-tonic = ["dep:tonic"]
 
@@ -122,6 +120,9 @@ transparent-inputs = [
     "zcash_primitives/transparent-inputs",
 ]
 
+## Enables receiving and spending Orchard funds.
+orchard = ["dep:orchard", "zcash_keys/orchard"]
+
 ## Exposes APIs that are useful for testing, such as `proptest` strategies.
 test-dependencies = [
     "dep:proptest",

zcash_client_sqlite/Cargo.toml

@@ -84,11 +84,14 @@ zcash_address = { workspace = true, features = ["test-dependencies"] }
 
 [features]
 default = ["multicore"]
-orchard = ["dep:orchard", "zcash_client_backend/orchard", "zcash_keys/orchard"]
 
 ## Enables multithreading support for creating proofs and building subtrees.
 multicore = ["maybe-rayon/threads", "zcash_primitives/multicore"]
 
+## Enables support for storing data related to the sending and receiving of 
+## Orchard funds.
+orchard = ["dep:orchard", "zcash_client_backend/orchard", "zcash_keys/orchard"]
+
 ## Exposes APIs that are useful for testing, such as `proptest` strategies.
 test-dependencies = [
     "incrementalmerkletree/test-dependencies",