Update docs/src/red_black_tree.md

eulerkochy · oxinabox · web-flow · commit 80b4b113a14d · 2020-08-22T21:25:25.000+05:30
Co-authored-by: Lyndon White &lt;oxinabox@ucc.asn.au&gt;
diff --git a/docs/src/red_black_tree.md b/docs/src/red_black_tree.md
@@ -18,7 +18,7 @@ julia> for k in 1:2:20
 julia> haskey(tree, 3)
 true
 
-julia> getindex(tree, 4)
+julia> tree[4]
 7
 
 julia> for k in 1:2:10
@@ -31,4 +31,4 @@ false
 
 ```@meta
 DocTestSetup = nothing
-```
+```
