small documentation fixes and simplify config struct

src/rpc/consul.rs

@@ -141,7 +141,7 @@ impl ConsulDiscovery {
 		let mut ret = vec![];
 
 		let dcs_to_query: Vec<Option<&str>> = match &self.config.datacenters {
-			Some(dcs) if !dcs.is_empty() => dcs.iter().map(|dc| Some(dc.as_str())).collect(),
+			dcs if !dcs.is_empty() => dcs.iter().map(|dc| Some(dc.as_str())).collect(),
 			_ => vec![None],
 		};
 

src/util/config.rs

@@ -258,7 +258,7 @@ pub struct ConsulDiscoveryConfig {
 	#[serde(default)]
 	pub meta: Option<std::collections::HashMap<String, String>>,
 	#[serde(default)]
-	pub datacenters: Option<Vec<String>>,
+	pub datacenters: Vec<String>,
 }
 
 #[derive(Deserialize, Debug, Clone)]