CSS line-height values should be unitless - about.css

[ianbelanger]

As outlined in #44643, CSS line-height values should be unitless unless necessary to be defined as a specific pixel value. It was suggested that we break up 44643 by stylesheet in order to better track them.

This ticket covers wp-admin/css/about.css

Note: The patch was tested only on a Windows machine in Chrome, Firefox, IE11 and Edge. As per https://core.trac.wordpress.org/ticket/44643#comment:23 it should probably be tested on other OS's and supported browsers

[ianbelanger]

Adjusting patch name to new ticket number

[mukesh27]

I tested this successfully without any error in Ubuntu 18.04.2 LTS with Google Chrome Version 73.0.3683.75 and Firefox Version 65.0.1

[SergeyBiryukov]

Fixed in [45130].