Increase precision of benchmarking results summary (#6092)

Co-authored-by: Matt Rutherford <mattrutherford@users.noreply.github.com>

substrate/bin/node/bench/src/core.rs

@@ -75,14 +75,14 @@ impl fmt::Display for NsFormatter {
 		}
 
 		if self.0 < 1_000_000 {
-			return write!(f, "{:.2} ms", v as f64 / 1_000_000.0)
+			return write!(f, "{:.4} ms", v as f64 / 1_000_000.0)
 		}
 
 		if self.0 < 100_000_000 {
-			return write!(f, "{} ms", v as f64 / 1_000_000.0)
+			return write!(f, "{:.1} ms", v as f64 / 1_000_000.0)
 		}
 
-		write!(f, "{:.2} s", v as f64 / 1_000_000_000.0)
+		write!(f, "{:.4} s", v as f64 / 1_000_000_000.0)
 	}
 }