Added missing docs

src/text/mod.rs

@@ -215,8 +215,11 @@ pub struct TextDiff<'old, 'new, 'bufs> {
 /// The tag of a change.
 #[derive(Debug, PartialEq, Eq, Hash, Clone, Copy, Ord, PartialOrd)]
 pub enum ChangeTag {
+    /// The change indicates equality (not a change)
     Equal,
+    /// The change indicates deleted text.
     Delete,
+    /// The change indicates inserted text.
     Insert,
 }
 

src/text/udiff.rs

@@ -223,7 +223,7 @@ impl<'diff, 'old, 'new, 'bufs> fmt::Display for UnifiedDiffHunk<'diff, 'old, 'ne
                 if self.missing_newline_hint {
                     writeln!(f, "\n\\ No newline at end of file")?;
                 } else {
-                    writeln!(f, "")?;
+                    writeln!(f)?;
                 }
             }
         }