Fixes typo _SOFT_TASK_TIME_LIMIT -> TASK_SOFT_TIME_LIMIT. Closes #926

docs/history/changelog-2.0.rst

@@ -763,7 +763,7 @@ News
         Hard time limit. The worker processing the task will be killed and
         replaced with a new one when this is exceeded.
 
-    * :setting:`CELERYD_SOFT_TASK_TIME_LIMIT`
+    * :setting:`CELERYD_TASK_SOFT_TIME_LIMIT`
 
         Soft time limit. The :exc:`~@SoftTimeLimitExceeded`
         exception will be raised when this is exceeded.  The task can catch

docs/history/changelog-2.1.rst

@@ -137,7 +137,7 @@ Fixes
 
     This has been fixed, and it is now released only once per task.
 
-* docs/configuration: Fixed typo `CELERYD_SOFT_TASK_TIME_LIMIT` ->
+* docs/configuration: Fixed typo `CELERYD_TASK_SOFT_TIME_LIMIT` ->
   :setting:`CELERYD_TASK_SOFT_TIME_LIMIT`.
 
     See issue #214

docs/userguide/workers.rst

@@ -301,7 +301,7 @@ time limit kills it:
             clean_up_in_a_hurry()
 
 Time limits can also be set using the :setting:`CELERYD_TASK_TIME_LIMIT` /
-:setting:`CELERYD_SOFT_TASK_TIME_LIMIT` settings.
+:setting:`CELERYD_TASK_SOFT_TIME_LIMIT` settings.
 
 .. note::