Clean up E0695 explanation

Author: GuillaumeGomez

src/librustc_error_codes/error_codes/E0695.md

@@ -1,6 +1,6 @@
 A `break` statement without a label appeared inside a labeled block.
 
-Example of erroneous code:
+Erroneous code example:
 
 ```compile_fail,E0695
 # #![feature(label_break_value)]