Fix various typos (#17621)

Found via `codespell -q 3 -S ./CHANGELOG.md,./AUTHORS.md,./config/locales,./app/javascript/mastodon/locales -L ba,keypair,medias,ro`

spec/services/block_domain_service_spec.rb

@@ -66,7 +66,7 @@ RSpec.describe BlockDomainService, type: :service do
       expect(Account.find_remote('badguy', 'evil.org').silenced_at).to_not eq DomainBlock.find_by(domain: 'evil.org').created_at
     end
 
-    it 'leaves the domains status and attachements, but clears media' do
+    it 'leaves the domains status and attachments, but clears media' do
       expect { bad_status1.reload }.not_to raise_error
       expect { bad_status2.reload }.not_to raise_error
       expect { bad_attachment.reload }.not_to raise_error

spec/services/clear_domain_media_service_spec.rb

@@ -13,7 +13,7 @@ RSpec.describe ClearDomainMediaService, type: :service do
       subject.call(DomainBlock.create!(domain: 'evil.org', severity: :silence, reject_media: true))
     end
 
-    it 'leaves the domains status and attachements, but clears media' do
+    it 'leaves the domains status and attachments, but clears media' do
       expect { bad_status1.reload }.not_to raise_error
       expect { bad_status2.reload }.not_to raise_error
       expect { bad_attachment.reload }.not_to raise_error

spec/services/delete_account_service_spec.rb

@@ -90,7 +90,7 @@ RSpec.describe DeleteAccountService, type: :service do
       let!(:account) { Fabricate(:account, inbox_url: 'https://bob.com/inbox', protocol: :activitypub) }
       let!(:local_follower) { Fabricate(:account) }
 
-      it 'sends a reject follow to follwer inboxes' do
+      it 'sends a reject follow to follower inboxes' do
         subject.call
         expect(a_request(:post, account.inbox_url)).to have_been_made.once
       end