MDL-63994 login: Clarify inline comments on loginpage_hook() usage
While working on the issue, I found these inline comments outdated and confusing. The auth plugin types can implement a loginpage_hook() method, the purpose of which is to inject the $user and/or $frm into this login/index.php script. The new comments should make it more clear. Note the second comment mentioned a prelogin_hook() which was an old name of what is now called loginpage_hook(). It had nothing to do with the existing pre_loginpage_hook() and was only confusing.
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