Here is what the Manual:$wgPasswordResetRoutes page states about $wgPasswordResetRoutes variable:
Setting all of these to false (or the whole variable to false) has the effect of disabling password resets entirely.
This is not quite true. While it removes the link from the login form, it is still possible to go to Special:Preferences page (or directly to Special:ChangePassword) and reset the password from there.
Either the wording needs to be changed in the manual (and in includes/DefaultSettings.php) or this feature is incomplete.
Tested in 1.24.1.