netdoc: Use a dev-dependency on anyhow to fix a doc example

Cargo.lock

@@ -4636,6 +4636,7 @@ name = "tor-netdoc"
 version = "0.8.0"
 dependencies = [
  "amplify",
+ "anyhow",
  "base64ct",
  "bitflags 2.3.1",
  "cipher",

crates/tor-netdoc/Cargo.toml

@@ -117,6 +117,7 @@ weak-table = "0.3.0"
 zeroize = "1"
 
 [dev-dependencies]
+anyhow = "1.0.23"
 hex-literal = "0.4"
 itertools = "0.10.1"
 serde_json = "1.0.50"

crates/tor-netdoc/src/doc/hsdesc.rs

@@ -218,7 +218,7 @@ impl HsDesc {
     /// let hsdesc = unchecked_decrypted_desc
     ///     .check_valid_at(&timestamp)?
     ///     .check_signature()?;
-    /// # Ok::<(), Error>(())
+    /// # Ok::<(), anyhow::Error>(())
     /// ```
     pub fn parse(
         input: &str,