docs(book): make old title anchorable #13102
Merged
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What does this PR try to resolve?
An alternative way to fix rust-lang/blog.rust-lang.org#1172
How should we test and review this PR?
I've tried custom heading attribute but that didn't work as you can only have one
id
per element.If there is a preferred solution, do let me know.
Additional information
r? ehuss