Fix typo of setUpClass

There are a few same pattern of typo related to setUpClass.
Let's fix them.

Change-Id: Ic835bb37353f1ef6623d55f294c09f4f06a4be44

doc/source/test-removal.rst

@@ -64,7 +64,7 @@ The Old Way using subunit2sql directly
 
 SELECT * from tests where test_id like "%test_id%";
 (where $test_id is the full test_id, but truncated to the class because of
-setupClass or tearDownClass failures)
+setUpClass or tearDownClass failures)
 
 You can access the infra mysql subunit2sql db w/ read-only permissions with:
 
@@ -82,7 +82,7 @@ you would run the following:
  #. run the query: MySQL [subunit2sql]> select * from tests where test_id like
     "tempest.api.compute.admin.test_flavors_negative.FlavorsAdminNegativeTestJSON%";
     which will return a table of all the tests in the class (but it will also
-    catch failures in setupClass and tearDownClass)
+    catch failures in setUpClass and tearDownClass)
  #. paste the output table with numbers and the mysql command you ran to
     generate it into the etherpad.
 

tempest/api/compute/servers/test_server_actions.py

@@ -471,7 +471,7 @@ class ServerActionsTestJSON(base.BaseV2ComputeTest):
 
         # NOTE: SHUTOFF is irregular status. To avoid test instability,
         #       one server is created only for this test without using
-        #       the server that was created in setupClass.
+        #       the server that was created in setUpClass.
         server = self.create_test_server(wait_until='ACTIVE')
         temp_server_id = server['id']