Doc-string Change

[younggentech]

Hello! I have changed documentation. It is my first open-source contribution ever...

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[what-the-diff]

PR Summary

• Modification of the 'Link' Class in fastkml/atom.py
  The 'Link' class has seen a few important changes. One of these is an updated comment that now explains that the 'rel' attribute is used to define the type of relationship. Moreover, the class description has been adapted to clarify that each feed is only allowed one alternate per type and hreflang. These changes will facilitate better understanding and correct usage of the class in future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (401c43b) 93.19% compared to head (60b2dc6) 93.19%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #253   +/-   ##
========================================
  Coverage    93.19%   93.19%           
========================================
  Files           34       34           
  Lines         4790     4790           
========================================
  Hits          4464     4464           
  Misses         326      326           

Files	Coverage Δ
fastkml/atom.py	100.00% <ø> (ø)

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