Mistype fix

docs/internals/core-code-style.md

@@ -310,7 +310,7 @@ $mul = array_reduce($numbers, function($r, $x) use($n) {
 Documentation
 -------------
 
-- Refer ot [phpDoc](http://phpdoc.org/) for documentation syntax.
+- Refer to [phpDoc](http://phpdoc.org/) for documentation syntax.
 - Code without documentation is not allowed.
 - All class files must contain a "file-level" docblock at the top of each file
   and a "class-level" docblock immediately above each class.