Consider editing strings for 6.5 About page

[sabernhardt]

• Correct performance metrics, according to Epic: 6.5 release highlight grid (visual asset) gutenberg#58028 (comment)
• Clarify that the Font Library is for block themes
• Edit the paragraph about Data Views

I also added a lang attribute and set the code element to inherit font-size because 13px bothered me.

Trac 60303

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[sabernhardt]

before: 13px

after: 1.125rem

[swissspidy]

https://core.trac.wordpress.org/changeset/57870