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(parent: d9c501d) | patch

Improve various aspects of pg_rewind documentation

Improve various aspects of pg_rewind documentation

The pg_rewind docs currently assert that the state of the target's
data directory after rewind is equivalent to the source's data
directory. This clarifies the documentation to describe that the base
state is further back in time and that the target's data directory will
include the current state from the source of any copied blocks since the
point of divergence.

This commit also improves the section "How It Works":
- Describe the update of the pg_control file.
- Reorganize the list of files and directories ignored during the
rewind.

Author: James Coleman
Discussion: https://postgr.es/m/CAAaqYe-sgqCos7MXF4XiY8rUPy3CEmaCY9EvfhX-DhPhPBF5_A@mail.gmail.com

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