docs: remove notice importing credentials not possible api doc

[vinckr]

• docs: remove notice importing credentials not possible

I tested with make sdk and looked as expected.

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
  confirm that I got green light (please contact
  [email protected]) from the maintainers to push
  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 #2418 (e7b15a7) into master (638d45c) will increase coverage by 0.07%.
The diff coverage is 50.00%.

❗ Current head e7b15a7 differs from pull request most recent head e03056d. Consider uploading reports for the commit e03056d to get more accurate results

@@            Coverage Diff             @@
##           master    #2418      +/-   ##
==========================================
+ Coverage   76.39%   76.46%   +0.07%     
==========================================
  Files         316      318       +2     
  Lines       17404    17150     -254     
==========================================
- Hits        13296    13114     -182     
+ Misses       3171     3099      -72     
  Partials      937      937              

Impacted Files	Coverage Δ
selfservice/strategy/oidc/provider_apple.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_discord.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_facebook.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_github.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_github_app.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_microsoft.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_slack.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_spotify.go	0.00% <0.00%> (ø)
selfservice/strategy/oidc/provider_vk.go	0.00% <ø> (ø)
selfservice/strategy/oidc/provider_yandex.go	0.00% <0.00%> (ø)
... and 62 more

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