docs(book): make old title anchorable

weihanglo · weihanglo · commit 4af0e57253b9 · 2023-12-02T11:55:57.000-05:00
See rust-lang/blog.rust-lang.org#1172
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
