Correct docs about invoice_expiry_delta_secs panic

[jkczyz]

The panic for invoice_expiry_delta_secs is only applicable for create_inbound_payment_legacy.

[codecov-commenter]

Codecov Report

Merging #1341 (f334205) into main (6259e7a) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head f334205 differs from pull request most recent head f1a6469. Consider uploading reports for the commit f1a6469 to get more accurate results

@@            Coverage Diff             @@
##             main    #1341      +/-   ##
==========================================
- Coverage   90.60%   90.59%   -0.01%     
==========================================
  Files          72       72              
  Lines       40075    40075              
==========================================
- Hits        36310    36306       -4     
- Misses       3765     3769       +4     

Impacted Files	Coverage Δ
lightning/src/ln/channelmanager.rs	84.69% <ø> (ø)
lightning/src/ln/functional_tests.rs	97.06% <0.00%> (-0.07%)	⬇️

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[TheBlueMatt]

Shouldn't we add a similar note on create_inbound_payment_for_hash_legacy?

[jkczyz]

Shouldn't we add a similar note on create_inbound_payment_for_hash_legacy?

Ah, yes. Done.