docs: PM updates to Guardrails library docs

[alexahaushalter]

No description provided.

[github-actions]

Documentation preview

https://nvidia-nemo.github.io/Guardrails/review/pr-1543

[greptile-apps]

Greptile Overview

Greptile Summary

This PR updates the main documentation landing page (docs/index.md) to rebrand "NeMo Guardrails toolkit" to "NeMo Guardrails library" throughout the file.

• Updated title from "NVIDIA NeMo Guardrails Toolkit Developer Guide" to "NVIDIA NeMo Guardrails Library Developer Guide"
• Replaced all instances of "toolkit" with "library" in section headings and descriptions
• Changed "guardrails configuration" to "Guardrails configuration" (capitalization update)

Note: This change only affects docs/index.md, while 44+ other documentation files still reference "toolkit". Consider a follow-up PR to update all documentation for terminology consistency.

Confidence Score: 5/5

• This PR is safe to merge - it contains only documentation text changes with no code impact.
• Score of 5 reflects that this is a simple terminology update in a single documentation file with no functional code changes, no risk of breaking builds or tests, and no security implications.
• No files require special attention.

Important Files Changed

File Analysis

Filename	Score	Overview
docs/index.md	4/5	Documentation terminology updated from "toolkit" to "library"; creates inconsistency with 44+ other doc files still using "toolkit".

Sequence Diagram

sequenceDiagram
    participant User
    participant DocsIndex as docs/index.md
    participant OtherDocs as Other Doc Files (44+)
    
    User->>DocsIndex: Views landing page
    DocsIndex-->>User: "NeMo Guardrails Library"
    User->>OtherDocs: Navigates to other docs
    OtherDocs-->>User: "NeMo Guardrails toolkit"
    Note over User: Terminology inconsistency

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[greptile-apps]

Additional Comments (1)

1. docs/index.md, line 6 (link)

   style: This PR updates "toolkit" to "library" in docs/index.md, but 44+ other documentation files still reference "toolkit" (e.g., docs/getting-started/installation-guide.md, docs/run-rails/index.md, docs/about/overview.md). Consider updating all documentation files for consistency, or note this as a follow-up task.

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