config-linux: RFC 2119 wording for oomScoreAdj

The previous wording hinted at, but did not require, this setting to
be implemented via oom_score_adj.  With the new wording, when proc is
mounted at /proc, the container process can check this value by
looking at /proc/self/oom_score_adj.

Signed-off-by: W. Trevor King <wking@tremily.us>

config-linux.md

@@ -265,13 +265,13 @@ For more information, see [the memory cgroup man page][cgroup-v1-memory].
 
 #### <a name="configLinuxSetOomScoreAdj" />Set oom_score_adj
 
-`oomScoreAdj` sets heuristic regarding how the process is evaluated by the kernel during memory pressure.
-For more information, see [the proc filesystem documentation section 3.1][procfs].
+* **`oomScoreAdj`** *(int, OPTIONAL)* adjusts the oom-killer score in `[pid]/oom_score_adj` for the container process's `[pid]` in a [proc pseudo-filesystem][procfs].
+    If `oomScoreAdj` is set, the runtime MUST set `oom_score_adj` to the given value.
+    If `oomScoreAdj` is not set, the runtime MUST not change the value of `oom_score_adj`.
+
 This is a kernel/system level setting, where as `disableOOMKiller` is scoped for a memory cgroup.
 For more information on how these two settings work together, see [the memory cgroup documentation section 10. OOM Contol][cgroup-v1-memory].
 
-* **`oomScoreAdj`** *(int, OPTIONAL)* - adjust the oom-killer score
-
 ###### Example
 
 ```json