Update README: to_fuzzy_refine is from telescope.actions, not lga_actions

[edwardrf]

Description

The mapping in the sample config does not seem to work, upon inspection, the to_fuzzy_refine should come from telescope.actions, instead of the lga_actions.

Fixes #91

Type of change

Documentation update

How Has This Been Tested?

Tested with my own setup.

Configuration:

• Neovim version (nvim --version): v0.10.1
• Operating system and version: Ubuntu 22.04

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)

[kkrime]

Thanks for this @edwardrf 👍