📝 document formatter message markup methods

docs/api/text-formatter-without-style-markup.md

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+---
+name: text-formatter-without-style-markup
+group: api
+category: formatter
+update-time: 20260613
+description: Return a TextFormatter with message style markup disabled.
+key-word:
+    - formatter
+    - style
+    - disable
+    - public
+---
+
+## Text-formatter-without-style-markup
+
+Return a copy of a `TextFormatter` with message style markup disabled. This is the convenience helper for the common case where message text should stay literal even if it contains tag-like syntax.
+
+### Interface
+
+```moonbit
+pub fn TextFormatter::without_style_markup(self : TextFormatter) -> TextFormatter {
+```
+
+#### input
+
+- `self : TextFormatter` - Base formatter to copy.
+
+#### output
+
+- `TextFormatter` - A new formatter value whose message markup policy is `StyleMarkupMode::Disabled`.
+
+### Explanation
+
+Detailed rules explaining key parameters and behaviors
+
+- This method is a convenience wrapper over `with_style_markup(StyleMarkupMode::Disabled)`.
+- Only the message-text markup scope changes.
+- Target and field-value markup settings are preserved as-is.
+- The original formatter value is not mutated.
+
+### How to Use
+
+Here are some specific examples provided.
+
+#### When Need Literal Message Text
+
+When log messages may contain `<tag>`-like text that should not be parsed:
+```moonbit
+let formatter = text_formatter(color_mode=ColorMode::Always)
+  .without_style_markup()
+```
+
+In this example, message text is rendered literally instead of interpreting inline style tags.
+
+#### When Need A Safe Variant Of A Styled Base Formatter
+
+When one formatter should keep the same colors and template but stop parsing message tags:
+```moonbit
+let base = text_formatter(color_mode=ColorMode::Always)
+let safe = base.without_style_markup()
+```
+
+In this example, the derived formatter only changes the message markup policy.
+
+### Error Case
+
+e.g.:
+- There is no dedicated failure path for valid `TextFormatter` values.
+
+- If target or field scopes should also stop parsing tags, callers need the corresponding dedicated formatter methods rather than this message-only helper.
+
+### Notes
+
+1. Use this helper when the disabled case is what you want directly.
+
+2. It is equivalent to calling `with_style_markup(StyleMarkupMode::Disabled)` explicitly.