[Mailer] Add new assertEmailAddressNotContains method

Author: santysisi

testing.rst

@@ -1082,8 +1082,8 @@ Mailer Assertions
 ``assertEmailHeaderSame(RawMessage $email, string $headerName, string $expectedValue, string $message = '')``/``assertEmailHeaderNotSame(RawMessage $email, string $headerName, string $expectedValue, string $message = '')``
     Asserts that the given email does (not) have the expected header set to
     the expected value.
-``assertEmailAddressContains(RawMessage $email, string $headerName, string $expectedValue, string $message = '')``
-    Asserts that the given address header equals the expected e-mail
+``assertEmailAddressContains(RawMessage $email, string $headerName, string $expectedValue, string $message = '')``/``/assertEmailAddressNotContains(RawMessage $email, string $headerName, string $expectedValue, string $message = '')``
+    Asserts that the given address header does (not) equal the expected e-mail
     address. This assertion normalizes addresses like ``Jane Smith
     <[email protected]>`` into ``[email protected]``.
 ``assertEmailSubjectContains(RawMessage $email, string $expectedValue, string $message = '')``/``assertEmailSubjectNotContains(RawMessage $email, string $expectedValue, string $message = '')``