docs: fix broken links API spec

[vinckr]

• fix: broken links API spec

closes ory/docs#656

only the links with .mdx were broken.

(and the ones leading to user-login/registration but seems to be fixed in the spec already.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
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  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #2295 (66bf01e) into master (dbcf3fb) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2295      +/-   ##
==========================================
+ Coverage   76.55%   76.57%   +0.01%     
==========================================
  Files         318      318              
  Lines       17148    17148              
==========================================
+ Hits        13128    13131       +3     
+ Misses       3087     3086       -1     
+ Partials      933      931       -2     

Impacted Files	Coverage Δ
courier/courier_dispatcher.go	56.86% <0.00%> (-9.81%)	⬇️
persistence/sql/persister_courier.go	88.33% <0.00%> (ø)
session/test/persistence.go	100.00% <0.00%> (+2.77%)	⬆️

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