docs #20986

- https://github.com/neovim/tree-sitter-vimdoc v1.2.4 eliminates most
  errors in pi_netrw.txt, so we can remove that workaround from
  ignore_parse_error().
- improved codeblock

runtime/lua/vim/lsp/semantic_tokens.lua

@@ -495,7 +495,6 @@ local M = {}
 --- delete the semanticTokensProvider table from the {server_capabilities} of
 --- your client in your |LspAttach| callback or your configuration's
 --- `on_attach` callback.
----
 --- <pre>lua
 ---   client.server_capabilities.semanticTokensProvider = nil
 --- </pre>