Wording improvement

Author: GuillaumeGomez

src/librustc_error_codes/error_codes/E0748.md

@@ -6,9 +6,11 @@ Erroneous code example:
 ```compile_fail,E0748
 let dolphins = r##"Dolphins!"#; // error!
 ```
+
 To terminate a raw string, you have to have the same number of `#` at the end
-than at the beginning. Example:
+as at the beginning. Example:
+
 ```
-let dolphins = r#"Dolphins!"#; // one `#` at the beginning, one at the end so
+let dolphins = r#"Dolphins!"#; // One `#` at the beginning, one at the end so
                                // all good!
 ```