fix: wrong word

ltoddy · ltoddy · commit 37543ce65618 · 2021-03-10T09:09:37.000+08:00
diff --git a/compiler/rustc_span/src/edition.rs b/compiler/rustc_span/src/edition.rs
@@ -20,7 +20,7 @@ pub enum Edition {
     Edition2015,
     /// The 2018 edition
     Edition2018,
-    /// The 2021 ediiton
+    /// The 2021 edition
     Edition2021,
 }
 
