Remove "@stable" annotation

Summary: I don't believe that `@stable` is useful anymore?

Test Plan: N/A

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13285

src/lint/engine/ArcanistLintEngine.php

@@ -38,8 +38,6 @@
  *
  * See @{article@phabricator:Arcanist User Guide: Customizing Lint, Unit Tests
  * and Workflows} for more information about configuring lint engines.
- *
- * @stable
  */
 abstract class ArcanistLintEngine {
 

src/lint/linter/ArcanistLinter.php

@@ -6,7 +6,6 @@
  * @task info Human Readable Information
  * @task state Runtime State
  * @task exec Executing Linters
- * @stable
  */
 abstract class ArcanistLinter {
 

src/lint/linter/xhpast/ArcanistXHPASTLintNamingHook.php

@@ -7,7 +7,6 @@
  * @task override   Overriding Symbol Name Lint Messages
  * @task util       Name Utilities
  * @task internal   Internals
- * @stable
  */
 abstract class ArcanistXHPASTLintNamingHook {
 

src/workflow/ArcanistWorkflow.php

@@ -32,8 +32,6 @@
  * @task  conduit   Conduit
  * @task  scratch   Scratch Files
  * @task  phabrep   Phabricator Repositories
- *
- * @stable
  */
 abstract class ArcanistWorkflow extends Phobject {