Fixes documentation of dynamic topics

[aokellermann]

Fixes outdated documentation on how to use dynamic topics (breaking change in v13).

Closes #6111

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (6965960) 78.98% compared to head (d49d94d) 78.15%.
Report is 62 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6664      +/-   ##
==========================================
- Coverage   78.98%   78.15%   -0.84%     
==========================================
  Files        2903     2541     -362     
  Lines      139771   127082   -12689     
==========================================
- Hits       110397    99318   -11079     
+ Misses      29374    27764    -1610     

Flag	Coverage Δ
unittests	78.15% <82.05%> (-0.84%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...e/src/CookieCrumble/Extensions/WriterExtensions.cs	100.00% <ø> (ø)
...CookieCrumble/src/CookieCrumble/TestEnvironment.cs	0.00% <ø> (ø)
...polloFederationRequestExecutorBuilderExtensions.cs	66.66% <100.00%> (ø)
...ensions/ApolloFederationSchemaBuilderExtensions.cs	86.66% <ø> (ø)
.../src/ApolloFederation/FederationTypeInterceptor.cs	100.00% <100.00%> (ø)
...ion/src/ApolloFederation/Helpers/ArgumentParser.cs	68.65% <100.00%> (+0.47%)	⬆️
...rc/AspNetCore.CommandLine/Command/ExportCommand.cs	100.00% <100.00%> (ø)
...tChocolateAspNetCoreServiceCollectionExtensions.cs	93.33% <ø> (+26.66%)	⬆️
...rc/AspNetCore/Extensions/HttpResponseExtensions.cs	26.31% <ø> (+4.57%)	⬆️
...pNetCore/src/AspNetCore/GraphQLRequestException.cs	25.00% <ø> (+5.00%)	⬆️
... and 13 more

... and 877 files with indirect coverage changes

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