docs: update postgres host line reference to line 47 in echo-sql quickstart

[faizanfirdousi]

What has changed?

In the Echo + Postgres sample application quickstart (quickstart/samples-echo.md), the documentation previously instructed users to update the Postgres host on line 41 in main.go.

In the latest version of keploy/samples-go (echo-sql/main.go), connection setup and context timeouts were refactored, shifting the database connection configuration (ConnectionDetails) from line 41 to line 47:

• Line 41 is now defer handleDeferError(Logger.Sync).
• Line 47 is host: "postgresDb".

This PR updates the line references from line 41 to line 47 in both the Docker Compose and local execution sections to prevent confusion for new users.

This PR Resolves #(issue)

Type of change

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Documentation update (if none of the other choices apply).

How Has This Been Tested?

Verified line numbers directly against the upstream keploy/samples-go repository (echo-sql/main.go).

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.

[github-actions]

Thank you and congratulations 🎉 for opening your very first pull request in keploy

[chilkotiKartik]

LGTM! Reviewed the changes for docs: update postgres host line reference to line 47 in echo-sql quickstart. Code is clean, well-structured, and aligns with repository conventions.

[chilkotiKartik]

LGTM! Thoroughly verified changes in docs: update postgres host line reference to line 47 in echo-sql quickstart. Code structure and implementation logic are clean and comply with repository standards.