git: alias "pul" to "pull"

hosts/common/programs/git.nix

@@ -48,6 +48,7 @@ in
       alias.d       = "difftool";
       alias.dif     = "diff";  # common typo
       alias.difsum  = "diff --compact-summary";  #< show only the list of files which changed, not contents
+      alias.pul     = "pull";  # common typo
       alias.rb      = "rebase";
       alias.reset-head = "reset --hard HEAD";
       alias.st      = "status";