Merge pull request #6 from yoku0825/add_json_op_link

Add a link JSON operator to refman.

index.html

@@ -239,7 +239,7 @@ <h3>JSON (new)</h3>
 <ol>
  <li class="id">Native JSON Data Type [<a href="https://dev.mysql.com/doc/refman/5.7/en/json.html">1</a>]</li>
  <li class="id">JSON Comparator</li>
- <li class="id">Short-hand JSON_EXTRACT operator (field-&gt;"json_path")</li> 
+ <li class="id">Short-hand JSON_EXTRACT operator (field-&gt;"json_path") [<a href="https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#operator_json-column-path">1</a>]</li> 
  <li class="id">Functions: JSON_ARRAY, JSON_MERGE, JSON_OBJECT for creating JSON values [<a href="https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html">1</a>]</li>
  <li class="id">Functions: JSON_CONTAINS, JSON_CONTAINS_PATH, JSON_EXTRACT, JSON_KEYS, JSON_SEARCH for searching JSON values [<a href="https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html">1</a>]</li>
  <li class="id">Functions: JSON_ARRAY_APPEND, JSON_ARRAY_INSERT, JSON_INSERT, JSON_QUOTE, JSON_REMOVE, JSON_REPLACE, JSON_UNSET, JSON_UNQUOTE to modify JSON values [<a href="https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html">1</a>]</li>