update docs: fix the position of flyout menu

Author: fanhefeng

docs/index.rst

@@ -86,7 +86,7 @@ Community contributors help translate this documentation into several languages.
 Note that they have varying degrees of completeness and up-to-dateness.
 The English version stands as a reference.
 
-You can switch between languages by clicking on the flyout menu in the bottom-left corner
+You can switch between languages by clicking on the flyout menu in the bottom-right corner
 and selecting the preferred language.
 
 * `Chinese <https://docs.soliditylang.org/zh-cn/latest/>`_