📝 Prettify gene symbols guide & logging

[falexwolf]

Before:

! Curating gene symbols is discouraged. See FAQ for more details.

After:

! indexing datasets with gene symbols can be problematic: https://docs.lamin.ai/faq/symbol-mapping

I have a case where I consciously want to use gene symbols for the sake of illustrating something; not for the sake of curating a large body of data.

Hearing some feedback from some users this seems to be very common. So, I'd not make the warning as harsh.

I was missing the URL so that I could read up on this.

Made the warning lowercase consistent with all other logging messages (including warnings).

Replace hanging indentation with vertically aligned indendation.

See:

• https://github.com/laminlabs/lamindb/issues/2211

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.36%. Comparing base (c54f99f) to head (e459790). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2210 +/- ## ======================================= Coverage 92.36% 92.36% ======================================= Files 54 54 Lines 6566 6566 ======================================= Hits 6065 6065 Misses 501 501 ```

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[Zethson]

Thank you!