docs(config): remove outdated terraform main.tf reference

[risu729]

Summary

• remove the outdated main.tf idiomatic version file reference for Terraform
• keep .terraform-version as the documented Terraform idiomatic version file

Reported in #3543.

Verification

• git grep -n "main\.tf\|main.tf" -- docs
• git diff --check

[gemini-code-assist]

Code Review

This pull request updates the documentation in docs/configuration.md to remove main.tf from the list of supported idiomatic version files for Terraform. There are no review comments to address, and the change looks straightforward.

[greptile-apps]

Greptile Summary

Removes main.tf from the Terraform idiomatic version file documentation table, since it was never actually implemented in the codebase and was causing confusion for users.

• docs/configuration.md: Single-cell table edit — removes main.tf from the Terraform row, leaving .terraform-version as the sole documented idiomatic version file, consistent with what the source code and e2e tests actually support.

Confidence Score: 5/5

Safe to merge — a one-line documentation correction with no runtime impact.

The change removes a single inaccurate entry from a documentation table. Source code grep confirms main.tf was never referenced as a Terraform version file in the implementation, so the docs correction is accurate and there is nothing that could regress.

No files require special attention.

Important Files Changed

Filename	Overview
docs/configuration.md	Removes outdated main.tf reference from the Terraform idiomatic version file table, leaving only .terraform-version which is the only entry supported in source code and tests.

_{Reviews (1): Last reviewed commit: "docs(config): remove outdated terraform ..." | Re-trigger Greptile}