Clean up E0644 explanation

diff --git a/src/librustc_error_codes/error_codes/E0644.md b/src/librustc_error_codes/error_codes/E0644.md
index 277643dfb1ab7d7ddffa4c2d861f590454c87976..8c68da3b2f310efafcd8a51a3af11fb1ea3cca32 100644 (file)
--- a/src/librustc_error_codes/error_codes/E0644.md
+++ b/src/librustc_error_codes/error_codes/E0644.md
@@ -1,6 +1,6 @@
 A closure or generator was constructed that references its own type.
 
-Erroneous example:
+Erroneous code example:
 
 ```compile_fail,E0644
 fn fix<F>(f: &F)