Fix fenced code examples

Author: abhro

src/composition/models/pipelines.jl

@@ -182,7 +182,7 @@ or what `transform` returns if it is `Unsupervised`.
 Names for the component fields are automatically generated unless
 explicitly specified, as in
 
-```
+```julia
 Pipeline(encoder=ContinuousEncoder(drop_last=false),
          stand=Standardizer())
 ```

src/resampling.jl

@@ -790,14 +790,15 @@ on a local server at `http://127.0.0.1:500`. Then every in every `evaluate` call
 `logger` is not specified, as in the example below, the peformance evaluation is
 automatically logged to the service.
 
-```julia-repl
+```julia
 using MLJ
 logger = MLJFlow.Logger("http://127.0.0.1:5000/api")
 default_logger(logger)
 
 X, y = make_moons()
 model = ConstantClassifier()
 evaluate(model, X, y, measures=[log_loss, accuracy)])
+```
 
 """
 function default_logger(logger)