Fix parameter documentation formatting for wp_img_tag_add_decoding_attr filter

[mukeshpanchal27]

Trac ticket: https://core.trac.wordpress.org/ticket/63166

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[mukeshpanchal27]

Introduce in 56690 / #53232

[github-actions]

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Props mukesh27.

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[github-actions]

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[SergeyBiryukov]

Thanks for the PR! Merged in r60780.