Fixed typos as pointed out by https://github.com/alerque

README

@@ -76,16 +76,16 @@ FAQ
   As of now, the code assume single-byte characters. To use UTF-8 text, you can
   always convert the encoding using mb_convert_encoding():
     ...
-    $from_text = mb_convert_encoding($from_text_utf8, 'HTML_ENTITIES', 'UTF-8');
-    $to_text = mb_convert_encoding($to_text_utf8, 'HTML_ENTITIES', 'UTF-8');
+    $from_text = mb_convert_encoding($from_text_utf8, 'HTML-ENTITIES', 'UTF-8');
+    $to_text = mb_convert_encoding($to_text_utf8, 'HTML-ENTITIES', 'UTF-8');
     $diff_opcodes = FineDiff::getDiffOpcodes($from_text, $to_text);
     ...
 
   If ever you want to re-generate the $to_text_utf8 from the $from_text_utf8:
     ...
-    $from_text = mb_convert_encoding($from_text_utf8, 'HTML_ENTITIES', 'UTF-8');
+    $from_text = mb_convert_encoding($from_text_utf8, 'HTML-ENTITIES', 'UTF-8');
     $to_text = FineDiff::renderToTextFromOpcodes($from_text, $diff_opcodes);
-    $to_text_utf8 = mb_convert_encoding($to_text, 'UTF-8', 'HTML_ENTITIES');
+    $to_text_utf8 = mb_convert_encoding($to_text, 'UTF-8', 'HTML-ENTITIES');
     ....