pbs: dependencies - typos and missing image

img/job_stages.svg

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pbs/dependencies.rst

@@ -58,8 +58,9 @@ construction (``$DEP`` will start with a ``:`` in the first iteration).
 
 .. important::
 
-    The dependency type is able to parse return values of all job dependencies
-    by using ``afterok`` (a return value of 0 / success), ``afternotok`` (any
-    non 0 value). For that to work the jobs have to return a proper exit
-    status! If you're unsure or if you don't care about return values, use
-    ``afterany`` as shown in the example.
+    The dependency type is able to handle return values of all job dependencies
+    by using either ``afterok`` (a return value of 0 - success), or
+    ``afternotok`` (any non 0 value - indication for an error). However, for
+    that mechanism to work all jobs have to return a proper exit status! If
+    you're unsure or if you don't care about return values, use ``afterany`` as
+    shown in the example.