docs: clarify client documentation

Again, these changes are just to effect a release.

A change to the release workflow also removes testing the environment variable and re-exporting it.
On the last build I ran, it appears to have worked as expected, where previously it didn't. Doesn't
really make any sense.

sn_client/src/api.rs

@@ -57,14 +57,15 @@ const CONNECTION_TIMEOUT: Duration = Duration::from_secs(30);
 const INACTIVITY_TIMEOUT: Duration = Duration::from_secs(30);
 
 impl Client {
-    /// A quick client that only takes some peers to connect to
+    /// A quick client with a random secret key and some peers.
     pub async fn quick_start(peers: Option<Vec<Multiaddr>>) -> Result<Self> {
         Self::new(SecretKey::random(), peers, None, None).await
     }
 
     /// Instantiate a new client.
     ///
-    /// Optionally specify the maximum time the client will wait for a connection before timing out.
+    /// Optionally specify the duration for the connection timeout.
+    ///
     /// Defaults to 180 seconds.
     ///
     /// # Arguments