pairplot fix f-string (#2003)
pairplot fix f-string (#2003)

* fix f-string

* Update arviz/plots/pairplot.py

Co-authored-by: Ari Hartikainen <2263af0442e6dbedc4d2504cb2bc8945462f5333@users.noreply.github.com>

Co-authored-by: Ari Hartikainen <2263af0442e6dbedc4d2504cb2bc8945462f5333@users.noreply.github.com>
arviz-devs/arviz,arviz-devs/arviz,arviz-devs/arviz,arviz-devs/arviz