(Doc+) Terminating Exit Codes (elastic#112530)

👋 howdy, team! Mini PR to cross-replicate [this knowledge article](https://support.elastic.co/knowledge/6610ba83) about Elasticsearch's exit codes which expands [this ES doc section](https://www.elastic.co/guide/en/elasticsearch/reference/master/stopping-elasticsearch.html#fatal-errors).

docs/reference/setup/stopping.asciidoc

@@ -50,9 +50,14 @@ such a shutdown, it does not go through an orderly shutdown as described above.
 process will also return with a special status code indicating the nature of the error.
 
 [horizontal]
+Killed by jvmkiller agent:: 158
+User or kernel SIGTERM:: 143
+Slain by kernel oom-killer:: 137
+Segmentation fault:: 134
 JVM internal error:: 128
 Out of memory error:: 127
 Stack overflow error:: 126
 Unknown virtual machine error:: 125
 Serious I/O error:: 124
+Bootstrap check failure:: 78
 Unknown fatal error:: 1