Fix updaterun API syntax in tutorial and examples

Fixes incorrect positional argument usage and string type for status parameter.
The updaterun function requires keyword arguments and RunStatus enum values.

Before: updaterun(mlf, exprun, "FINISHED")
After:  updaterun(mlf, exprun; status=RunStatus.FINISHED)

Fixes #64

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: RomeoV

docs/src/tutorial.md

@@ -109,7 +109,7 @@ logartifact(mlf, exprun, plotfilename)
 rm(plotfilename)
 
 # complete the experiment
-updaterun(mlf, exprun, "FINISHED")
+updaterun(mlf, exprun; status=RunStatus.FINISHED)
 ```
 
 This will result in the folowing experiment created in your `MLFlow` which is running on `http://localhost/`:

examples/simple-with-mlflow.jl

@@ -58,4 +58,4 @@ logartifact(mlf, exprun, plotfilename)
 rm(plotfilename)
 
 # complete the experiment
-updaterun(mlf, exprun, "FINISHED")
+updaterun(mlf, exprun; status=RunStatus.FINISHED)