Update comment for ReplicationSlot.last_saved_restart_lsn

Document that restart_lsn can go backwards and explain why this could happen.

Discussion: https://postgr.es/m/1d12d2-67235980-35-19a406a0%4063439497
Discussion: 
https://postgr.es/m/CAPpHfdvuyMrUg0Vs5jPfwLOo1M9B-GP5j_My9URnBX0B%3DnrHKw%40mail.gmail.com
Author: Hayato Kuroda <kuroda.hay...@fujitsu.com>
Co-authored-by: Amit Kapila <amit.kapil...@gmail.com>
Reviewed-by: Vignesh C <vignes...@gmail.com>
Reviewed-by: Amit Kapila <amit.kapil...@gmail.com>
Reviewed-by: Alexander Korotkov <aekorot...@gmail.com>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/0810fbb02dbe70b8a7a7bcc51580827b8bbddbdc

Modified Files
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src/include/replication/slot.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

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