fix(docs): fix demo typegraphs 2

[destifo]

Fix example typegraphs on metatype.dev.

• reduce.ts
• policies.ts
• graphql.ts
• authentication.ts

MET_574

Migration notes

No Migrations Needed

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[linear]

MET-574 (docs) fix demo typegraphs 2

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 73.40%. Comparing base (9ed105d) to head (da2ff65).
Report is 3 commits behind head on main.

Files	Patch %	Lines
typegate/src/runtimes/prisma/prisma.ts	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #756      +/-   ##
==========================================
+ Coverage   73.06%   73.40%   +0.34%     
==========================================
  Files         116      115       -1     
  Lines       14150    14027     -123     
  Branches     1417     1416       -1     
==========================================
- Hits        10338    10297      -41     
+ Misses       3786     3704      -82     
  Partials       26       26              

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