Update docs

docs/make.jl

@@ -17,6 +17,7 @@ makedocs(;
             "manual/rootfiles.md",
             "manual/detector.md",
             "manual/calibration.md",
+            "manual/tools.md",
         ],
         "Examples" => Any[
             "examples/offline_data.md",

docs/src/manual/calibration.md

 # Calibration
 
+It's implemented but not documented here yet. Check out the docs `calibrate`
+function's docstring!
 

docs/src/manual/rootfiles.md

@@ -299,4 +299,5 @@ julia> f = ROOTFile("root://ccxroot:1999//hpss/in2p3.fr/group/km3net/data/raw/se
 ROOTFile{OnlineTree (136335 events, 107632 summaryslices)}
 ```
 
-Now you can
+Now you can use it as if it was on your local filesystem. `UnROOT.jl` will take
+care of loading only the needed data from the server.