Improve doc comment

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/dag.rs

@@ -236,6 +236,7 @@ impl FlowDag {
     /// - it exists in the DAG
     /// - it is not already started or completed
     /// - it has no dependencies, or all dependencies are completed
+    ///
     /// If any job has failed, the entire flow is considered failed and an error is returned.
     pub fn ready_jobs(&self) -> DagResult<Vec<u32>> {
         if let Some(failed_job) = self.failed_job {
@@ -333,7 +334,9 @@ impl FlowDag {
         }
         match self.failed_job {
             Some(existing) if existing == job => Ok(()),
-            Some(existing) => Err(DagError::FlowFailed { failed_job: existing }),
+            Some(existing) => Err(DagError::FlowFailed {
+                failed_job: existing,
+            }),
             None => {
                 self.failed_job = Some(job);
                 Ok(())