docs(book): make old title anchorable

See rust-lang/blog.rust-lang.org#1172
rust-lang · Dec 2, 2023 · 4af0e57 · 4af0e57
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commit 4af0e57
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diff --git a/src/doc/src/reference/specifying-dependencies.md b/src/doc/src/reference/specifying-dependencies.md
@@ -113,6 +113,7 @@ Here are some examples of comparison requirements:
 = 1.2.3
 ```
 
+<span id="multiple-requirements"></span>
 ### Multiple version requirements
 
 As shown in the examples above, multiple version requirements can be