Update documentation about field content selector.md

Now accessible at Library > Library properties > Field Content Selector

en/advanced/contentselector.md

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 # Field content selector
 
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-This information is outdated. Please help to improve it \([how to edit a help page](../contributing/how-to-improve-the-help-page.md#editing-help-pages-directly-in-the-browser)\).
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-This feature allows you to store a selection of often-used words or phrases that you use often in your database. By default it is enabled for the fields _Journal_, _Author_, _Keywords_ and _Publisher_, but you can also add selectors to other fields, in the upper part of the _Manage_ dialog \(menu **Options -→ Manage content selectors**\).
+This feature is accessible via **Library → Library properties → Manage content selectors** and allows you to store a selection of often-used words or phrases that you use often in your database. By default it is enabled for the fields _Journal_, _Author_, _Keywords_ and _Publisher_, but you can also add selectors to other fields.
 
 The word selection is database-specific, and is saved along with your references in the .bib file.