I have updated the commitfest submission to link to the correct patch email.
Thanks Gurjeet.
I initially thought that this patch deserves accompanying documentation because pg_dump's serializable transaction may error out because of a conflict. But the following line in the docs [1] confirms otherwise:
"read-only transactions will never have serialization conflicts"
So no doc patch necessary :)
Can you please mark the patch as "Ready for committer" if you think that way ?