more format tweaks

Author: ablaom

src/metadata_utils.jl

@@ -219,8 +219,7 @@ From MLJ, the type can be imported using
 
     $name = @load $name pkg=$package_name
 
-Construct an instance with default hyper-parameters using the syntax
-`model = $name()`.
+Do `model = $name()` to construct an instance with default hyper-parameters.
 """ |> chomp
 
     isempty(params) && return ret

test/metadata_utils.jl

@@ -75,8 +75,8 @@ From MLJ, the type can be imported using
 FooRegressor = @load FooRegressor pkg=FooRegressorPkg
 ```
 
-Construct an instance with default hyper-parameters using the syntax
-`model = FooRegressor()`. Provide keyword arguments to override hyper-parameter
+Do `model = FooRegressor()` to construct an instance with default hyper-parameters.
+Provide keyword arguments to override hyper-parameter
 defaults, as in `FooRegressor(a=...)`.
 """ |> chomp |> Markdown.parse