docs: correct small typos in Testset Generation page and related md components

[deibid]

I noticed a few small typos and inconsistent casing in the Testset Generation page and a related markdown component.

[greptile-apps]

Greptile Summary

This PR addresses documentation quality improvements across two files:

1. In rag_testset_generation.md, fixes a grammatical error by replacing 'will will' with 'we will' in the Quickstart section's introduction.

2. In choose_generator_llm.md, improves capitalization consistency and fixes typos:

   • Properly capitalizes sentences starting with 'Then'
   • Corrects 'Wrapp' to 'Wrap'
   • Ensures consistent sentence casing throughout

These changes enhance readability and professionalism of the documentation without affecting any functionality.

Confidence score: 5/5

1. This PR is extremely safe to merge with virtually no risk
2. The changes are purely documentation-focused, fixing clear grammatical errors and typos with no potential for functional impact
3. No files need special attention - all changes are straightforward text corrections

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