Fix typos

CONTRIBUTING.md

@@ -26,7 +26,7 @@ To do so, we will launch arti independently from Tor Browser. Build arti with
 `cargo build --release`.  After that launch it with some basic
 configuration parameters:
 
-    $ ./target/release/arti -c "socks_port = 9150" -c "trac e =false"
+    $ ./target/release/arti -c "socks_port = 9150" -c "trace = false"
 
 This will ensure that arti sets its SOCKS port on 9150. Now we need to launch
 Tor Browser and instruct it to use that SOCKS port:

arti/src/main.rs

@@ -126,7 +126,7 @@ pub struct ArtiConfig {
     /// Information about when and how often to download directory information
     download_schedule: DownloadScheduleConfig,
 
-    /// Facility to override network pparameters from the values set in the
+    /// Facility to override network parameters from the values set in the
     /// consensus.
     #[serde(default)]
     override_net_params: HashMap<String, i32>,