Fix references to set-config --show in docs

Test Plan: Crossed many fingers.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9298

src/docs/user/userguide/arcanist.diviner

@@ -162,7 +162,7 @@ several sources:
 
 The first place where the setting is defined wins.
 
-Existing settings can be printed with `arc set-config --show`.
+Existing settings can be printed with `arc get-config`.
 
 == Next Steps ==
 

src/docs/user/userguide/arcanist_new_project.diviner

@@ -74,7 +74,7 @@ These options are supported, but their use is discouraged:
     solution to certificate validity problems, and is discouraged. Instead,
     use valid certificates.
 
-For a complete list of options, run `arc set-config --show`. Although all
+For a complete list of options, run `arc get-config`. Although all
 options can be set in `.arcconfig`, some options (like `editor`) usually do not
 make sense to set here because they're likely to vary from user to user.