Revert "Fixed some grammatical errors in...

Revert "Fixed some grammatical errors in raw_email_with_invalid_characters_in_content_type. Picky, I know."

This reverts commit 30aa4e6c.

Reason: docrails doesn't allow changing code. As much as this is a plain
text file, I would still like to enforce the policy strictly.

actionmailer/test/fixtures/raw_email_with_invalid_characters_in_content_type

@@ -19,9 +19,8 @@ This is a multi-part message in MIME format.
 Content-Type: text/plain; charset=iso-8859-1
 Content-Transfer-Encoding: Quoted-printable
 
-Hello,
-
-This is an outlook test.
+Hello
+This is an outlook test
 
 So there.