Fix link to make_lplr_LZZ2020

Author: SvenKlaassen

doc/plm/lplr.qmd

@@ -24,7 +24,7 @@ init_notebook_mode(all_interactive=True)
 
 ## ATE Coverage
 
-The simulations are based on the  the [make_lplr_LZZ2020](https://docs.doubleml.org/stable/api/generated/doubleml.datasets.make_lplr_LZZ2020.html)-DGP with $500$ observations.
+The simulations are based on the  the [make_lplr_LZZ2020](https://docs.doubleml.org/stable/api/generated/doubleml.plm.datasets.make_lplr_LZZ2020.html)-DGP with $500$ observations.
 
 ::: {.callout-note title="Metadata"  collapse="true"}
 
@@ -110,4 +110,4 @@ generate_and_show_styled_table(
     level_col="level",
     coverage_highlight_cols=["Coverage"]
 )
-```
+```