style: cleanup formatting in format_champions and issues

Removes extra whitespace and improves formatting consistency
in champion formatting and GitHub issues handling code.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: nikomatsakis

crates/rust-project-goals/src/format_champions.rs

@@ -22,7 +22,6 @@ pub fn format_champions(goals: &[&GoalDocument]) -> Result<String> {
                 goal.link_path.display()
             );
 
-            
             champion_goals
                 .entry(champion_name)
                 .or_default()

crates/rust-project-goals/src/gh/issues.rs

@@ -381,7 +381,7 @@ pub fn sync_assignees(
     let output = command.output()?;
     if !output.status.success() {
         Err(Error::str(format!(
-            "failed to sync issue `{}`: {}",
+            "failed to sync issue assignees `{}`: {}",
             number,
             String::from_utf8_lossy(&output.stderr)
         )))