fix typo

Author: muxueqz

docs/libraries_support.rst

@@ -17,7 +17,7 @@ You can use PyInstaller to packages PyWebIO application into a stand-alone execu
 
 2. Edit the spec file, change the ``datas`` parameter of ``Analysis``::
 
-    from pywebio.util import pyinstaller_datas
+    from pywebio.utils import pyinstaller_datas
 
     a = Analysis(
         ...

docs/locales/zh_CN/LC_MESSAGES/libraries_support.po

@@ -61,7 +61,7 @@ msgstr "编辑生成的spec文件，将其中 ``Analysis`` 的 ``data`` 参数
 
 #: ../../libraries_support.rst:18
 msgid ""
-"from pywebio.util import pyinstaller_datas\n"
+"from pywebio.utils import pyinstaller_datas\n"
 "\n"
 "a = Analysis(\n"
 "    ...\n"