Fix docs: correct inheritance class for Non-LLM metrics

[AlanPonnachan]

Issue Link / Problem Description

• Fixes Documentation Bug: Non-LLM metrics inheritance described incorrectly #2271
• The Metrics Overview docs currently say:

  "All LLM based metrics in ragas are inherited from Metric class."
  This is incorrect.

• Correct inheritance is:
  • LLM-based metrics → MetricWithLLM
  • Non-LLM-based metrics → Metric

Changes Made

• Updated docs/concepts/metrics/overview/index.md
• Corrected wording to reflect that Non-LLM-based metrics inherit from Metric.
• Ensures consistency between docs and actual implementation.

Testing

How to Test

• Automated tests added/updated → Not applicable (docs-only change)
• Manual testing steps:

References

• Related issue: Documentation Bug: Non-LLM metrics inheritance described incorrectly #2271
• Documentation page: Metrics Overview

Screenshots/Examples (if applicable)

Before:

All LLM based metrics in ragas are inherited from Metric class.

After:

All Non-LLM-based metrics in ragas are inherited from Metric class.

[anistark]

Thanks for the quick fix @AlanPonnachan 🙌🏼