API documentation link to more tips (#7305)

https://github.com/jocmp/capyreader/discussions/533#discussioncomment-11341808
While waiting for https://github.com/FreshRSS/FreshRSS/issues/7304
We should then consolidate the API synchronisation recommendations in our documentation

docs/en/developers/06_GoogleReader_API.md

@@ -98,4 +98,5 @@ curl -H "Authorization:GoogleLogin auth=alice/8e6845e089457af25303abc6f53356eb60
 as many clients start by having a very inneficient synchronisation strategy.
 
 * [*Synchronisation recommendation* by Alkarex](https://github.com/FreshRSS/FreshRSS/issues/2566#issuecomment-541317776)
+* [*Additional synchronisation tips* by Alkarex](https://github.com/jocmp/capyreader/discussions/533#discussioncomment-11341808)
 * [*The Right Way to Sync* by BazQux](https://github.com/bazqux/bazqux-api#user-content-the-right-way-to-sync)