Improve Pallet UI doc test

[ggwpez]

Test currently failing, therefore improving to include a file from the same crate to not trip up the caching.

R0 silent since this is only modifying unpublished crates.

[seadanda]

Sorry 😅

[athei]

The test was flaky because it became out of sync with the README it was testing against?

[ggwpez]

The test was flaky because it became out of sync with the README it was testing against?

CI/CD team is investigating if its a caching issue since it included a file from a different crate (which is possibly incorrectly cached). But it should have normally not failed. This MR just fixes the behaviour of using a real readme and uses testing readmes from the same crate instead.

[paritytech-cicd-pr]

The CI pipeline was cancelled due to failure one of the required jobs.
Job name: test-linux-stable 2/3
Logs: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/6913794

[seadanda]

Interesting, my grammar nits have accidentally repeated the issue but within the same package. Looks like the docs cache is refreshed but not the cache of the package itself (if I'm interpreting the diff properly (?))

[ggwpez]

Interesting, my grammar nits have accidentally repeated the issue but within the same package. Looks like the docs cache is refreshed but not the cache of the package itself (if I'm interpreting the diff properly (?))

Yea, or the CI was started in between two commits where i applied your suggestions. Going to restart and wait.

PS: Another typo