Fix incorrect documentation of XcmMetadata::fee_factor

[maltekliemann]

What does it do?

The documentation incorrectly states that the fee_factor uses the same number of decimals that the foreign asset uses. It actually uses the same number of decimals that every asset uses on Zeitgeist - ten.

What important points should reviewers know?

Is there something left for follow-up PRs?

What alternative implementations were considered?

Are there relevant PRs or issues?

References

[Chralt98]

LGTM

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.26%. Comparing base (6868482) to head (9cb9465).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1360   +/-   ##
=======================================
  Coverage   93.26%   93.26%           
=======================================
  Files         133      133           
  Lines       29721    29721           
=======================================
  Hits        27718    27718           
  Misses       2003     2003           

Flag	Coverage Δ
tests	93.26% <ø> (ø)

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[spazcoin]

Thanks for clearing this up.