ARROW-10985: [Rust] Update unsafe guidelines for adding JIRA references
ARROW-10985: [Rust] Update unsafe guidelines for adding JIRA references

See changes for details

Closes #8969 from andygrove/ARROW-10985

Authored-by: Andy Grove <f68909d51919859739a1c5d24450a2cc1026e93b@gmail.com>
Signed-off-by: Andy Grove <f68909d51919859739a1c5d24450a2cc1026e93b@gmail.com>

kou/arrow,laurentgo/arrow,kou/arrow,apache/arrow,laurentgo/arrow,apache/arrow,cpcloud/arrow,kou/arrow,wesm/arrow,cpcloud/arrow,kou/arrow,apache/arrow,apache/arrow,apache/arrow,icexelloss/arrow,apache/arrow,kou/arrow,wesm/arrow,wesm/arrow,laurentgo/arrow,cpcloud/arrow,icexelloss/arrow,cpcloud/arrow,apache/arrow,wesm/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,kou/arrow,apache/arrow,laurentgo/arrow,icexelloss/arrow,wesm/arrow,cpcloud/arrow,cpcloud/arrow,icexelloss/arrow,cpcloud/arrow,laurentgo/arrow,kou/arrow,wesm/arrow,wesm/arrow,icexelloss/arrow,apache/arrow,icexelloss/arrow,laurentgo/arrow,apache/arrow,laurentgo/arrow,kou/arrow,laurentgo/arrow,laurentgo/arrow,laurentgo/arrow,kou/arrow,kou/arrow,wesm/arrow,wesm/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,icexelloss/arrow,icexelloss/arrow,kou/arrow,icexelloss/arrow,kou/arrow,cpcloud/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,apache/arrow,cpcloud/arrow,cpcloud/arrow,icexelloss/arrow,apache/arrow,wesm/arrow,laurentgo/arrow,cpcloud/arrow,icexelloss/arrow