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Format-check the documentation examples in CI (#5386)

* Reformat parser_callback_t example with astyle

The file uses "json & /*parsed*/" in three lambda parameter lists, which
astyle rewrites to "json& /*parsed*/" per --align-reference=type. The
drift went unnoticed because CI never format-checked the documentation
examples; "make pretty" does cover them.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Format-check the documentation examples in CI

The examples live in docs/mkdocs/docs/examples, but both format checks
still referenced the long-gone docs/examples path:

- check_amalgamation.yml passed it to find, which printed an error for
  the missing path and carried on, so astyle only ever saw include and
  tests. The step still exited 0.
- ci.cmake globbed it into INDENT_FILES, and a GLOB_RECURSE over a
  missing directory silently yields nothing, so the ci_test_amalgamation
  target skipped the examples too.

Either way the 231 example files have never been format-checked. Point
both at the real path, and guard the workflow with an explicit directory
check so a future rename fails the job instead of quietly shrinking the
file list again.

Also drop the dead docs/examples/** path filter from
publish_documentation.yml; docs/mkdocs/** already covers the examples.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>

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