feat(Share\IManager): add `matchUserId` method and update docs

Add missing `matchUserId` method for full-match-autocomplete options
and update docs to make it clearer what each options exactly means.

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

lib/private/Share20/Manager.php

@@ -1932,6 +1932,10 @@ class Manager implements IManager {
 		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_email', 'yes') === 'yes';
 	}
 
+	public function matchUserId(): bool {
+		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_userid', 'yes') === 'yes';
+	}
+
 	public function ignoreSecondDisplayName(): bool {
 		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_ignore_second_dn', 'no') === 'yes';
 	}

lib/public/Share/IManager.php

@@ -441,7 +441,8 @@ interface IManager {
 	public function limitEnumerationToPhone(): bool;
 
 	/**
-	 * Check if user enumeration is allowed to return on full match
+	 * Check if user enumeration is allowed to return also on full match
+	 * and ignore limitations to phonebook or groups.
 	 *
 	 * @return bool
 	 * @since 21.0.1
@@ -449,7 +450,8 @@ interface IManager {
 	public function allowEnumerationFullMatch(): bool;
 
 	/**
-	 * Check if the search should match the email
+	 * When `allowEnumerationFullMatch` is enabled and `matchEmail` is set,
+	 * then also return results for full email matches.
 	 *
 	 * @return bool
 	 * @since 25.0.0
@@ -457,7 +459,8 @@ interface IManager {
 	public function matchEmail(): bool;
 
 	/**
-	 * Check if the search should ignore the second in parentheses display name if there is any
+	 * When `allowEnumerationFullMatch` is enabled and `ignoreSecondDisplayName` is set,
+	 * then the search should ignore matches on the second displayname and only use the first.
 	 *
 	 * @return bool
 	 * @since 25.0.0