Show plot() usage in n_factors() examples (#1205)

* Initial plan

* docs: show plot example for n_factors

Agent-Logs-Url: https://github.com/easystats/parameters/sessions/ffe1fac9-e7bb-45d7-be07-e065b5a504f7

Co-authored-by: DominiqueMakowski <8875533+DominiqueMakowski@users.noreply.github.com>

* fix

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: DominiqueMakowski <8875533+DominiqueMakowski@users.noreply.github.com>
Co-authored-by: Daniel <mail@danielluedecke.de>

Author: 3 people

DESCRIPTION

@@ -1,7 +1,7 @@
 Type: Package
 Package: parameters
 Title: Processing of Model Parameters
-Version: 0.28.3.7
+Version: 0.28.3.8
 Authors@R:
     c(person(given = "Daniel",
              family = "Lüdecke",