docs: fix TypeORM Transactions section TypeORM links

[hiqueCa]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/docs.nestjs.com/blob/master/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Docs
• Other... Please describe:

What is the current behavior?

• TypeORM links on the techniques/database#typeorm-transactions section redirect to the home page of TypeORM's website:

Screen.Recording.2025-09-18.at.06.56.05.mov

Issue Number: N/A

What is the new behavior?

• TypeORM links on the techniques/database#typeorm-transactions section redirect to the correct specific pages on TypeORM's website:

Screen.Recording.2025-09-18.at.06.59.05.mov

Does this PR introduce a breaking change?

• Yes
• No

Other information

[kamilmysliwiec]

lgtm