Incorrectly escaped percent sign in "about security"

[tobifjellner]

Location: https://meta.trac.wordpress.org/browser/sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-main/page-about-security.php around line 77

printf(
/* translators: 1: WordPress Market share - 30. Note the following % sign is escaped as %%. 2: Footnote 3: Market Penetration - 60.  Note the following % sign is escaped as %%. */
__( 'WordPress is a free and open source content management system (CMS). It is the most widely-used CMS software in the world and it powers more than %1$s%% of the top 10 million websites%2$s, giving it an estimated 58% market share of all sites
using a CMS.', 'wporg' ),
WP_MARKET_SHARE,
'<sup id="ref1"><a href="#footnote1">1</a></a></sup>',
60
);

The problem here is with "58%", and it's twofold:

1. "58" would better be a parameter.
2. The percent sign needs to be escaped into %%

[dd32]

In 6997:

Main: About: Correct an incorrect placeholder in a string.

H/t tobifjellner.
Fixes #3542.