Removed duplicated binding of two methods

They are bound as both regular and virtual methods which makes ClassDB
report the methods twice when querying the API. The non-virtual binding
is removed since both methods only seem to be used as virtual.

scene/resources/syntax_highlighter.cpp

@@ -115,8 +115,6 @@ void SyntaxHighlighter::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("clear_highlighting_cache"), &SyntaxHighlighter::clear_highlighting_cache);
 	ClassDB::bind_method(D_METHOD("get_text_edit"), &SyntaxHighlighter::get_text_edit);
 
-	ClassDB::bind_method(D_METHOD("_get_line_syntax_highlighting", "p_line"), &SyntaxHighlighter::_get_line_syntax_highlighting);
-	ClassDB::bind_method(D_METHOD("_update_cache"), &SyntaxHighlighter::_update_cache);
 	ClassDB::bind_method(D_METHOD("_clear_highlighting_cache"), &SyntaxHighlighter::_clear_highlighting_cache);
 
 	BIND_VMETHOD(MethodInfo(Variant::DICTIONARY, "_get_line_syntax_highlighting", PropertyInfo(Variant::INT, "p_line")));