fix: use pointer of string for PasswordIdentifier in example code

[johejo]

Related issue(s)

db638cd

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
  security@ory.sh) 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

[aeneasr]

Awesome, thank you! 🎉 Your contribution makes Ory better :)

[codecov]

Codecov Report

Merging #2421 (f58378e) into master (638d45c) will decrease coverage by 0.01%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master    #2421      +/-   ##
==========================================
- Coverage   76.39%   76.38%   -0.02%     
==========================================
  Files         316      316              
  Lines       17404    17431      +27     
==========================================
+ Hits        13296    13314      +18     
- Misses       3171     3181      +10     
+ Partials      937      936       -1     

Impacted Files	Coverage Δ
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_netid.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% <0.00%> (ø)
selfservice/strategy/oidc/provider_yandex.go	0.00% <0.00%> (ø)
... and 10 more

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[vinckr]

Hello @johejo
Congrats on merging your first PR in Ory 🎉 !
Your contribution will soon be helping secure millions of identities around the globe 🌏.
As a small token of appreciation we send all our first time contributors a gift package to welcome them to the community.
Please drop me an email and I will forward you the form to claim your Ory swag!