Move link_section example to the intro

Author: ehuss

src/abi.md

@@ -90,17 +90,18 @@ r[abi.link_section]
 ## The `link_section` attribute
 
 r[abi.link_section.intro]
+The *`link_section` [attribute]* specifies the section of the object file that a [function] or [static]'s content will be placed into.
+
+> [!EXAMPLE]
+> <!-- no_run: don't link. The format of the section name is platform-specific. -->
+> ```rust,no_run
+> #[unsafe(no_mangle)]
+> #[unsafe(link_section = ".example_section")]
+> pub static VAR1: u32 = 1;
+> ```
 
 r[abi.link_section.syntax]
 The `link_section` attribute uses the [MetaNameValueStr] syntax to specify the section name.
-The *`link_section` [attribute]* specifies the section of the object file that a [function] or [static]'s content will be placed into.
-
-<!-- no_run: don't link. The format of the section name is platform-specific. -->
-```rust,no_run
-#[unsafe(no_mangle)]
-#[unsafe(link_section = ".example_section")]
-pub static VAR1: u32 = 1;
-```
 
 r[abi.link_section.unsafe]
 This attribute is unsafe as it allows users to place data and code into sections of memory not expecting them, such as mutable data into read-only areas.