Revert "operation -> adjustment (tidymodels/tailor#19)"

This reverts commit e329395.

Author: simonpcouch

tests/testthat/_snaps/printing.md

@@ -199,7 +199,7 @@
     Message
       
       -- tailor ----------------------------------------------------------------------
-      A regression postprocessor with 0 adjustments.
+      A regression postprocessor with 0 operations.
     Output
       NA
       NA

tests/testthat/test-post-action-tailor.R

@@ -58,7 +58,7 @@ test_that("update a postprocessor", {
   workflow <- add_tailor(workflow, post)
   workflow <- update_tailor(workflow, post2)
 
-  expect_length(workflow$post$actions$tailor$tailor$adjustments, 1)
+  expect_length(workflow$post$actions$tailor$tailor$operations, 1)
 })
 
 test_that("update a postprocessor after postprocessor fit", {
@@ -74,7 +74,7 @@ test_that("update a postprocessor after postprocessor fit", {
 
   workflow_with_post_new <- update_tailor(workflow_with_post, post2)
 
-  expect_length(workflow_with_post_new$post$actions$tailor$tailor$adjustments, 1)
+  expect_length(workflow_with_post_new$post$actions$tailor$tailor$operations, 1)
 
   # Note that the fitted model and preprocessor can remain; the new
   # postprocessor will not affect it (#225)