fixing two links in doc

Author: tlienart

docs/src/man/extending_ls.md

@@ -21,7 +21,7 @@ As an example of a custom callback, here is a simple modified callback mechanism
 custom_callback(fp::AbstractString) = (println("Hello!"); file_changed_callback(fp))
 ```
 
-A more sophisticated customised callback is the one that is used in [`servedocs`](@ref) (see [`LiveServer.servedocs_callback`](@ref)).
+A more sophisticated customised callback is the one that is used in [`servedocs`](@ref) (see [`LiveServer.servedocs_callback!`](@ref)).
 The callback has a different behaviour depending on which file is modified and does a few extra steps before signalling the viewers to reload appropriate pages.
 
 ## Writing your own `FileWatcher`

docs/src/man/ls+lit.md

@@ -163,8 +163,8 @@ julia> servedocs(literate=joinpath("docs", "literate"))
 
 if you navigate to `localhost:8000` you should end up with
 
-![](/assets/testlit.png)
+![](../assets/testlit.png)
 
 if you modify `testlit/docs/literate/man/pg1.jl` for instance writing `f(4)` it will be applied directly:
 
-![](/assets/testlit2.png)
+![](../assets/testlit2.png)