PHPMailer: Merge upstream commit (PR274).

props zodiac1978.
fixes #27946.

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Remove unnecessary semicolon.

props ixkaito.
fixes #29784.
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Show the number of approved comments instead of all comments on
the dashboard in the "At a glance" section.

fixes #26738. props benjmay
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Use a more specific selector for the count displayed on Add Themes network admin screen.

props mantismamita, nikolov.tmw.
fixes #29421.
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Use HTTPS links for planet.wordpress.org

see #27115
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Use HTTPS URLs for core.trac.wordpress.org

see #27115
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Use HTTPS URLs for trac.wordpress.org (and use core.trac.wordpress.org)

see #27115
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Account for longer translations of 'Customize Your Site' button label.

props shooper.
fixes #29451.
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Fix padding for parent theme link on Edit Themes screen.

props kraftner.
fixes #27825.
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Change the default orderby value in wp_get_nav_menus() to 'name'.

props voldemortensen, igmoweb.
fixes #29460.
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git-svn-id: http://core.svn.wordpress.org/trunk@29564 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update documentation for `wp_get_nav_menus()` to reflect that the default value for the the 'orderby' argument was changed from 'none' to 'name' in 4.1.

Props curtjen.
Fixes #29460.

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