Reword note telling people not to use autocomplete for ordinary search

Prompted by https://stackoverflow.com/q/76324437/1853523 - while we want to encourage people to use the most appropriate search method, telling them outright not to use autocomplete is a bit extreme. Remove the note in favour of some gentler advice.

docs/topics/search/searching.md

@@ -38,17 +38,13 @@ The Elasticsearch backend now defaults to matching on complete words. Previously
 
 ### Autocomplete searches
 
-Wagtail provides a separate method which performs partial matching on specific autocomplete fields. This is useful for suggesting pages to the user in real-time as they type their query.
+Wagtail provides a separate method which performs partial matching on specific autocomplete fields. This is primarily useful for suggesting pages to the user in real-time as they type their query - it is not recommended for ordinary searches, as the autocompletion will tend to add unwanted results beyond the specific term being searched for.
 
 ```python
 >>> EventPage.objects.live().autocomplete("Eve")
 [<EventPage: Event 1>, <EventPage: Event 2>]
 ```
 
-```{note}
-This method should only be used for real-time autocomplete and actual search requests should always use the `search()` method.
-```
-
 (wagtailsearch_images_documents_custom_models)=
 
 ### Searching Images, Documents and custom models