[manual] Improve requirements and editor wording

Author: oblitum

docs/user/readme.adoc

@@ -159,11 +159,11 @@ Emacs support is maintained as part of the https://github.com/emacs-lsp/lsp-mode
 3. Run `lsp` in a Rust buffer.
 4. (Optionally) bind commands like `lsp-rust-analyzer-join-lines`, `lsp-extend-selection` and `lsp-rust-analyzer-expand-macro` to keys.
 
-=== Vim
+=== Vim/NeoVim
 
-Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>.
+Prerequisites: You have installed the <<rust-analyzer-language-server-binary,`rust-analyzer` binary>>. Not needed if the extension can install/update it on its own, coc-rust-analyzer is one example.
 
-The are several LSP client implementations for vim:
+The are several LSP client implementations for vim or neovim:
 
 ==== coc-rust-analyzer