doc: Describe calculation method of streaming start for pg_receivewal

Michael Paquier <michael@paquier.xyz>

Commit: fb1aa489e481eb28aee18d4d2d268e76d46740ed
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-10-23T05:43:48Z
Releases: 12.9
doc: Describe calculation method of streaming start for pg_receivewal

The documentation was imprecise about the starting LSN used for WAL
streaming if nothing can be found in the local archive directory
defined with the pg_receivewal command, so be more talkative on this
matter.

Extracted from a larger patch by the same author.

Author: Ronan Dunklau, Michael Paquier
Discussion: https://postgr.es/m/18708360.4lzOvYHigE@aivenronan
Backpatch-through: 10

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doc/src/sgml/ref/pg_receivewal.sgml modified +23 −0

Documentation touched

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