Fix test case typo

Author: youkidearitai

ext/mbstring/tests/mb_trim.phpt

@@ -48,7 +48,7 @@ var_dump(mb_rtrim("ああああああああああああああああああああ
 echo "== default params ==\n";
 var_dump(mb_trim(" \f\n\r\v\x00\u{00A0}\u{1680}\u{2000}\u{2001}\u{2002}\u{2003}\u{2004}\u{2005}\u{2006}\u{2007}\u{2008}\u{2009}\u{200A}\u{2028}\u{2029}\u{202F}\u{205F}\u{3000}\u{0085}\u{180E}"));
 
-echo "== Surrogate pair ==\n";
+echo "== Byte Order Mark ==\n";
 var_dump(mb_ltrim("\u{FFFE}漢字", "\u{FFFE}\u{FEFF}"));
 var_dump(bin2hex(mb_ltrim(mb_convert_encoding("\u{FFFE}漢字", "UTF-16LE", "UTF-8"), mb_convert_encoding("\u{FFFE}\u{FEFF}", "UTF-16LE", "UTF-8"), "UTF-16LE")));
 var_dump(bin2hex(mb_ltrim(mb_convert_encoding("\u{FEFF}漢字", "UTF-16BE", "UTF-8"), mb_convert_encoding("\u{FFFE}\u{FEFF}", "UTF-16BE", "UTF-8"), "UTF-16BE")));
@@ -104,7 +104,7 @@ string(15) "いああああ"
 string(102) "あああああああああああああああああああああああああああああああああい"
 == default params ==
 string(0) ""
-== Surrogate pair ==
+== Byte Order Mark ==
 string(6) "漢字"
 string(8) "226f575b"
 string(8) "6f225b57"