Fix another typo (symbolicated) (#382)

Author: bugadani

src/print.rs

@@ -58,7 +58,7 @@ impl<'a, 'b> BacktraceFmt<'a, 'b> {
     /// Prints a preamble for the backtrace about to be printed.
     ///
     /// This is required on some platforms for backtraces to be fully
-    /// sumbolicated later, and otherwise this should just be the first method
+    /// symbolicated later, and otherwise this should just be the first method
     /// you call after creating a `BacktraceFmt`.
     pub fn add_context(&mut self) -> fmt::Result {
         #[cfg(target_os = "fuchsia")]