Adding Required attribute to username and password field in wp_login_form

[Rcreators]

'required_username' and 'required_password' added to defaults. By default, both are set to false. So required attribute will not add to input fields. If set to true in $args for wp_login_form(), it will add the required attribute to the respective input field.

Trac ticket: https://core.trac.wordpress.org/ticket/60062

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[github-actions]

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Props rcreators, joedolson, rajinsharwar.

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[github-actions]

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[joedolson]

Add the two new array parameters to the wp_login_form() function docs.

[joedolson]

E.g.

 *     @type bool   $required_username Whether the username field has the 'required' attribute. Default false.
 *     @type bool   $required_password Whether the password field has the 'required' attribute. Default false.

[Rcreators]

@joedolson Can you check and approve changes?

[Rajinsharwar]

@Rcreators Added some comments if you can review please.

[Rcreators]

@Rajinsharwar Requested changes amended.

[audrasjb]

committed in https://core.trac.wordpress.org/changeset/58382