update api docs

docs/.vuepress/public/doxy/global__functions_8php.html

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+<p >获取一个 KV 库实例</p>
+<dl class="params"><dt>参数</dt><dd>
+  <table class="params">
+    <tr><td class="paramtype">string</td><td class="paramname">$name</td><td>KV 库名称 </td></tr>
+  </table>
+  </dd>
+</dl>
+<dl class="section return"><dt>返回</dt><dd>CacheInterface </dd></dl>
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 函数调用图:</div>
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