docs: fix --no-color to --nocolor in CLI documentation

Agent-Logs-Url: https://github.com/htmlhint/HTMLHint/sessions/1da63fc7-ae86-4465-b623-c50fe7e3d8e5

Co-authored-by: coliff <1212885+coliff@users.noreply.github.com>

Author: Copilot

website/src/content/docs/usage/cli.md

@@ -18,9 +18,9 @@ Use `npx htmlhint --help` to print the CLI documentation.
 
 In addition to the [standard options](/usage/options/), the CLI accepts:
 
-### `--color, --no-color`
+### `--nocolor`
 
-Force enabling/disabling of color.
+Disable color in the output.
 
 ### `--init`