prettier

62195dd1 - Add .sl to the list of silentlyIgnoredDirs (#14206)

Add .sl to the list of silentlyIgnoredDirs (#14206) In [Sapling SCM](https://sapling-scm.com/), `.sl/` is the folder where it stores its state, analogous to `.git/` in Git. It should be ignored in Prettier like the other SCM folders.