feat: publicize doc implemetation

one/docs/en-US/components/loading.md

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+# Loading
+
+## Demos
+
+### Stylistic variants
+
+Available style variants for the `ui` prop: `normal`/`strong`/`reverse`.
+
+[[demo src="/demo/loading/style.vue"]]
+
+### Size variants
+
+Available size variants for the `ui` prop: `s`/`m`/`l`.
+
+[[demo src="/demo/loading/size.vue"]]
+
+### Layout variants
+
+Available layout variants for the `ui` prop: `vertical`.
+
+[[demo src="/demo/loading/layout.vue"]]
+
+### Custom loading icons
+
+Using `spinner` slot to replace default loading icon.
+
+[[demo src="/demo/loading/slot.vue"]]
+
+## API
+
+| Name | Type | Default | Description |
+| -- | -- | -- | -- |
+| `ui` | `string=` | `normal` `m` | [^ui] |
+| `loading` | `boolean` | `false` | Whether the component is in loading state. |
+
+^^^ui
+Style variants. A space-separated list of enum values.
+
++++Enum
+| Value | Description |
+| -- | -- |
+| `strong` | Strong style. |
+| `reverse` | Reverse style, typically used on dark background. |
+| `vertical` | Vertical style.|
+| `s` | Small style. |
+| `m` | Medium. |
+| `l` | Large style. |
++++
+^^^
+
+### Slots
+
+| Name | Description |
+| -- | -- |
+| `spinner` | Loading icon. |
+| `default` | Loading description. |