fix link

Author: puredanger

content/reference/deps_edn.adoc

@@ -502,7 +502,7 @@ The runtime basis is a representation of the dependency environment when the Clo
 The runtime basis can be accessed from within Clojure, using the https://clojure.github.io/clojure/#clojure.java.basis[clojure.java.basis] API. It includes access to both the initial basis and the current basis, which may be modified by the https://clojure.github.io/clojure/clojure.repl-api.html#clojure.repl.deps/add-libs[add-libs] and related functions.
 
 .Index of runtime basis attributes
-[[index]]
+[[basis_index]]
 [subs=+macros]
 ----
 {;; The basis is a superset of the merged <<deps_edn#index,deps.edn>>