fixed minor issue in tutorial-11

Author: Shravan Goswami

tutorials/11-probabilistic-pca/index.qmd

@@ -103,9 +103,8 @@ All packages used in this tutorial are listed here.
 You can install them via `using Pkg; Pkg.add("package_name")`.
 
 Package usages:
-::: {.callout-tip}
-## hello
 
+::: {.callout-caution}
 We use `DataFrames` for instantiating matrices, `LinearAlgebra` and `FillArrays` to perform matrix operations;
 `Turing` for model specification and MCMC sampling, `ReverseDiff` for setting the automatic differentiation backend when sampling.
 `StatsPlots` for visualising the resutls. `, Measures` for setting plot margin units.