Update docs

Author: mskelton

README.md

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 # null-ls.nvim
 
 Use Neovim as a language server to inject LSP diagnostics, code actions, and
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 null-ls sources are able to hook into the following LSP features:
 
 - Code actions
-
 - Diagnostics (file- and project-level)
-
 - Formatting (including range formatting)
-
 - Hover
-
 - Completion
 
 null-ls includes built-in sources for each of these features to provide
@@ -306,20 +295,18 @@ If you run into plenary-related issues while running the tests, make sure you
 have an up-to-date version of the plugin by clearing that cache with:
 `make clean`.
 
-All tests expect to run on the latest release version of Neovim and are not guaranteed to work on versions built from `HEAD`.
+All tests expect to run on the latest release version of Neovim and are not
+guaranteed to work on versions built from `HEAD`.
 
 ## Alternatives
 
 - [efm-langserver](https://github.com/mattn/efm-langserver) and
   [diagnostic-languageserver](https://github.com/iamcco/diagnostic-languageserver):
   general-purpose language servers that can provide formatting and diagnostics
   from CLI output.
-
 - [nvim-lint](https://github.com/mfussenegger/nvim-lint): a Lua plugin that
   focuses on providing diagnostics from CLI output.
-
 - [formatter.nvim](https://github.com/mhartington/formatter.nvim): a Lua plugin
   that (surprise) focuses on formatting.
-
 - [hover.nvim](https://github.com/lewis6991/hover.nvim): Hover plugin framework
   for Neovim.

doc/BUILTIN_CONFIG.md

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 # Using and configuring built-in sources
 
 null-ls includes a library of built-in sources meant to provide out-of-the-box

doc/CONFIG.md

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 # Installing and configuring null-ls
 
 You can install null-ls using any package manager. Here is a simple example

doc/MAIN.md

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 # null-ls Documentation
 
 Splits into the following documents: