Update README.md - spelling, grammar, and capitalization

[HanClinto]

Description

• Minor spelling and grammar fixes.

• Note on "LLAMA2" vs. "LLaMA2" vs. "Llama2" -- it appears that the first version of Meta's model was capitalized as "LLaMA", but future versions have been referred to as "Llama2":

  • Initial version referred to as LLaMA: https://arxiv.org/abs/2302.13971
  • Later versions referred to as "Llama2": https://ai.meta.com/llama/

• Re-implements Update README.md - minor spelling correction #582 into the develop branch, along with a couple other fixes.

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)
• This change requires a documentation update
• README-only change

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Thanks @HanClinto jump into the discord if you have time for a chat (tag me I'm Piero Savastano)

https://discord.gg/bHX5sNFCYU