pg_restore: Fix wrong descriptions of --with-{schema,data,statistics} options.

pg_restore: Fix wrong descriptions of --with-{schema,data,statistics} options.

Commit bde2fb797aa added the --with-schema, --with-data, and --with-statistics
options to pg_restore. These options control whether to restore schema, data,
or statistics if present in the archive. However, the help message and
documentation incorrectly described them as affecting what gets dumped.

This commit corrects those descriptions to clarify that the options control
restoration, not dumping.

Bug: #18952
Reported-by: TAKATSUKA Haruka 
Author: Fujii Masao 
Reviewed-by: TAKATSUKA Haruka 
Reviewed-by: Daniel Gustafsson 
Discussion: https://postgr.es/m/18952-be40a620f8b1e755@postgresql.org