Spell JavaScript in accordance with the word mark.

[peterwilsoncc]

https://core.trac.wordpress.org/ticket/60699

[github-actions]

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Props peterwilsoncc, mukesh27, dmsnell.

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[github-actions]

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Test this pull request with WordPress Playground.

[mukeshpanchal27]

The changes look good to me.

[dmsnell]

The hTML aPI changes look good. Thanks for upstreaming the change!

[peterwilsoncc]

Merged r58397 / 459d996