Contains broken links

[RalfJung]

I need to update the reference to get rust-lang/rust#51361 merged, but unfortunately that failed because the reference has gained some broken links since it was last updated:

[01:12:56] reference/items/implementations.html:268: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`
[01:12:56] reference/expressions/block-expr.html:205: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`
[01:12:56] reference/print.html:2292: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`
[01:12:56] reference/print.html:3485: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`
[01:12:56] reference/print.html:3845: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`
[01:12:56] reference/statements.html:227: broken link fragment `#lint-check-attributes.html` pointing to `reference/attributes.html`

Cc @Havvy