Help screen for Search module doesn't make limitations clear

The help screen for the search module should make it clear to site administrators that without installing an n-gram or stemming module, only exact word matches are supported in search.

The reason I think this is important is that with Google and other web searches, people have gotten used to being able to search for, say, "walk" and find web pages with words like "walking", "walked", etc. in them. Drupal core search does not currently support that, and the help text should make that clear. It always surprises people that Drupal's core Search module doesn't support this.

Ideally, I think the help screen would also say that you can install an n-gram or stemming module to change this behavior, but since these are contrib modules, I don't know about the politics of adding this text to the help screen.

There is also a move afoot to add n-gram to search, see #103548: Partial Search in Drupal Core. If this is implemented, the help text would need to change, but I think it would still be beneficial to add a mention of stemming, since for some sites, depending on the language, stemming may be a better approach than n-grams (it is more efficient, and since it relies on linguistics, should be more accurate than the blind n-gram approach).