docs: syntax-errors: mobile quotes

Author: coderaiser

docs/syntax-errors.md

@@ -19,6 +19,9 @@
 -const a = 'hello;
 +const a = 'hello';
 
+-const b = ‘hello world’;
++const b = 'hello world';
+
 -x('hello);
 +x('hello');
 const m = {