Try fixing spaces

Author: Saransh-cpp

docs/src/tutorials/linear_regression.md

@@ -271,10 +271,10 @@ Let's start by initializing our dataset. We will be using the [`BostonHousing`](
 ```jldoctest linear_regression_complex
 julia> dataset = BostonHousing()
 dataset BostonHousing:
-   metadata   =>    Dict{String, Any} with 5 entries
-   features   =>    506×13 DataFrame
-   targets    =>    506×1 DataFrame
-   dataframe  =>    506×14 DataFrame
+    metadata   =>    Dict{String, Any} with 5 entries
+    features   =>    506×13 DataFrame
+    targets    =>    506×1 DataFrame
+    dataframe  =>    506×14 DataFrame
 
 julia> x, y = BostonHousing(as_df=false)[:];
 ```