docs(lsp): mention default enablement of document colors (#35153)

runtime/doc/lsp.txt

@@ -97,6 +97,8 @@ BUFFER-LOCAL DEFAULTS
   - To opt out of this use |gw| instead of gq, or clear 'formatexpr' on |LspAttach|.
 - |K| is mapped to |vim.lsp.buf.hover()| unless |'keywordprg'| is customized or
   a custom keymap for `K` exists.
+- Document colors are enabled for highlighting color references in a document.
+  - To opt out call `vim.lsp.document_color.enable(false, args.buf)` on |LspAttach|.
 
 DISABLING DEFAULTS                                      *lsp-defaults-disable*
 You can remove GLOBAL keymaps at any time using |vim.keymap.del()| or
@@ -2126,15 +2128,6 @@ enable({enable}, {bufnr}, {opts})            *vim.lsp.document_color.enable()*
     Enables document highlighting from the given language client in the given
     buffer.
 
-    You can enable document highlighting when a client attaches to a buffer as
-    follows: >lua
-        vim.api.nvim_create_autocmd('LspAttach', {
-          callback = function(args)
-            vim.lsp.document_color.enable(true, args.buf)
-          end
-        })
-<
-
     To "toggle", pass the inverse of `is_enabled()`: >lua
         vim.lsp.document_color.enable(not vim.lsp.document_color.is_enabled())
 <

runtime/lua/vim/lsp/document_color.lua

@@ -286,15 +286,6 @@ end
 
 --- Enables document highlighting from the given language client in the given buffer.
 ---
---- You can enable document highlighting when a client attaches to a buffer as follows:
---- ```lua
---- vim.api.nvim_create_autocmd('LspAttach', {
----   callback = function(args)
----     vim.lsp.document_color.enable(true, args.buf)
----   end
---- })
---- ```
----
 --- To "toggle", pass the inverse of `is_enabled()`:
 ---
 --- ```lua