docs: Fix outdated instructions

[smith558]

Fixes outdated instructions to be in line with recent changes (https://www.prisma.io/docs/orm/more/upgrade-guides/upgrading-versions/upgrading-to-prisma-7#driver-adapters-and-client-instantiation).

Summary by CodeRabbit

• Documentation
  • Updated ORM introduction documentation to demonstrate PostgreSQL adapter initialization and configuration patterns using environment-based connection strings.

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[coderabbitai]

Walkthrough

This pull request updates Prisma documentation to demonstrate PrismaPg adapter usage in PrismaClient initialization. A data modeling example file is modified to show importing and instantiating the PrismaPg adapter, then passing it to PrismaClient configuration, replacing the default client initialization pattern.

Changes

Cohort / File(s)	Summary
PostgreSQL Adapter Initialization Documentation content/200-orm/050-overview/100-introduction/300-data-modeling.mdx	Adds PrismaPg adapter import and instantiation example, updates PrismaClient initialization to pass the adapter instance via { adapter } configuration, includes commented alternative showing require-based syntax

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

Possibly related PRs

• feat: update read replica docs #7344 — Implements the same PrismaPg adapter initialization pattern in PrismaClient setup across Prisma documentation examples
• Add PlanetScale Postgres documentation #7433 — Documents PrismaClient instantiation with the PrismaPg adapter in a related context within the Prisma documentation
• DR-6807 Documented { schema } object for Postgres adapters in v7 #7438 — Covers PrismaPg adapter schema and configuration options documentation that complements the adapter initialization shown in this PR

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'docs: Fix outdated instructions' is vague and generic. While it correctly identifies the PR as documentation, it lacks specificity about what instructions were outdated or what the fix entails.	Consider revising to something more specific like 'docs: Update client initialization to use PrismaPg adapter' to clearly convey the primary change being documented.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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