docs: enhance docSearch integration with language (#697)

Author: Sylvain Pace

docs/default-theme-config/README.md

@@ -336,7 +336,7 @@ module.exports = {
 Unlike the [built-in search](#built-in-search) engine which works out of the box, [Algolia DocSearch](https://community.algolia.com/docsearch/) requires you to submit your site to them for indexing before it starts working. 
 :::
 
-For more options, refer to [Algolia DocSearch's documentation](https://github.com/algolia/docsearch#docsearch-options).
+For more options, refer to [Algolia DocSearch's documentation](https://community.algolia.com/docsearch/documentation/docsearch/introduction/).
 
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