Rollup merge of rust-lang#57913 - h-michael:fix-crate-visibility-modifier-issue-number, r=Centril

Change crate-visibility-modifier issue number in The Unstable Book

rust-lang#45388 is closed.
Because, it's duplicate issue of rust-lang#53120.

Author: Centril

src/doc/unstable-book/src/language-features/crate-visibility-modifier.md

@@ -1,8 +1,8 @@
 # `crate_visibility_modifier`
 
-The tracking issue for this feature is: [#45388]
+The tracking issue for this feature is: [#53120]
 
-[#45388]: https://github.com/rust-lang/rust/issues/45388
+[#53120]: https://github.com/rust-lang/rust/issues/53120
 
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