Fix typos (#398)

Found via `typos --format brief`

src/stats/client.rs

@@ -92,7 +92,7 @@ impl ClientStats {
         }
     }
 
-    /// Reports a client is disconecting from the pooler and
+    /// Reports a client is disconnecting from the pooler and
     /// update metrics on the corresponding pool.
     pub fn disconnect(&self) {
         self.reporter.client_disconnecting(self.client_id);
@@ -140,7 +140,7 @@ impl ClientStats {
         self.error_count.fetch_add(1, Ordering::Relaxed);
     }
 
-    /// Reportes the time spent by a client waiting to get a healthy connection from the pool
+    /// Reporters the time spent by a client waiting to get a healthy connection from the pool
     pub fn checkout_time(&self, microseconds: u64) {
         self.total_wait_time
             .fetch_add(microseconds, Ordering::Relaxed);

src/stats/server.rs

@@ -102,7 +102,7 @@ impl ServerStats {
         self.state.store(ServerState::Idle, Ordering::Relaxed);
     }
 
-    /// Reports a server connection is disconecting from the pooler.
+    /// Reports a server connection is disconnecting from the pooler.
     /// Also updates metrics on the pool regarding server usage.
     pub fn disconnect(&self) {
         self.reporter.server_disconnecting(self.server_id);