Fix a comment typo

Co-authored-by: Alfredo Garcia <oxarbitrage@gmail.com>

zebrad/src/components/tracing.rs

@@ -108,7 +108,7 @@ pub struct Config {
     /// replaced with `.folded` and `.svg` for the respective files.
     pub flamegraph: Option<PathBuf>,
 
-    /// Shows progress bars for block syncing, and mempool transactions, and peer networking.
+    /// Shows progress bars for block syncing, mempool transactions, and peer networking.
     /// Also sends logs to the default log file path.
     ///
     /// This config field is ignored unless the `progress-bar` feature is enabled.