fix invalid anchor links

Author: puredanger

content/about/differences.adoc

@@ -269,7 +269,7 @@ self-host / bootstrapped ClojureScript via its `cljs.js/\*load-fn*` capability.
 * `def` and `binding` work as in Clojure
 ** but on ordinary js variables
 ** Clojure can represent unbound vars. In ClojureScript `(def x)` results in `(nil? x)` being true.
-** In Clojure, `def` yields the _var itself_. In ClojureScript `def` yields the _value_, unless the REPL option <<xref/../../../reference/repl-options#def-emits-var#,:def-emits-var>> is set (this defaults to `true` for REPLs).  
+** In Clojure, `def` yields the _var itself_. In ClojureScript `def` yields the _value_, unless the REPL option <<xref/../../../reference/repl-options#def-emits-var,:def-emits-var>> is set (this defaults to `true` for REPLs).  
 * Atoms work as in Clojure
 * Refs and Agents are not currently implemented
 * Validators work as in Clojure

content/about/functional-programming.adoc

@@ -17,7 +17,7 @@ Clojure is a functional programming language. It provides the tools to avoid mut
 
 == First-class functions
 
-<<xref/../../reference/special_forms#fn#,fn>> creates a function object. It yields a value like any other - you can store it in a var, pass it to functions etc.
+<<xref/../../reference/special_forms#fn,fn>> creates a function object. It yields a value like any other - you can store it in a var, pass it to functions etc.
 [source,clojure]
 ----
 (def hello (fn [] "Hello world"))
@@ -138,4 +138,4 @@ In the absence of mutable local variables, looping and iteration must take a dif
 (my-zipmap [:a :b :c] [1 2 3])
 -> {:b 2, :c 3, :a 1}
 ----
-For situations where mutual recursion is called for, recur can't be used. Instead, http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/trampoline[trampoline] may be a good option.
+For situations where mutual recursion is called for, recur can't be used. Instead, http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/trampoline[trampoline] may be a good option.

content/reference/compiler-options.adoc

@@ -969,7 +969,7 @@ Defaults to `true` if ClojureScript is being used via `cljs.main`, and `false` o
 [[infer-externs]]
 === :infer-externs
 
-Enables automatically generating externs for interop calls to JavaScript. Defaults to `false`. For more info see <<xref/../../guides/externs#externs-inference#,Externs (Alpha)>>
+Enables automatically generating externs for interop calls to JavaScript. Defaults to `false`. For more info see <<xref/../../guides/externs#externs-inference,Externs (Alpha)>>
 
 [source,clojure]
 ----