Fix missing class name in "Unknown tag" message #2398
Merged
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Problem
Introduced in #2378, the class of the unknown tags are never shown given that the string of the unknown tags is passed as second argument instead of string interpolation.
Reprex
Created on 2024-02-15 with reprex v2.1.0
Solution
Analogue to https://github.com/r-lib/pkgdown/pull/2378/files#diff-7800ebb360a3c28cd33101ef6ea07c562247ec30a029d0a69d527a80f17bff17L158-R164. I also changed the severity to warning.