docs: telescope.txt spelling and grammar fixes

[vladdoster]

Description

Correct grammar and spelling errors in documentation to improve readability.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list relevant details about your configuration

Install telescope.nvim plugin using my fork and branch to verify my changes do not break formatting.

Configuration:

• Neovim version (nvim --version): NVIM v0.8.2
• Operating system and version: Darwin 22.2.0 arm64

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[Conni2461]

Thanks :) I had to rebase because of another proof read pr and had to change the docs in the code because telescope.txt is actually autogenerated so your changes would have been reverted without the changes in the comments.