Update link_ordinal to use the attribute template

Author: ehuss

src/items/external-blocks.md

@@ -431,11 +431,29 @@ The *`link_ordinal` [attribute][attributes]* can be applied on declarations insi
 > }
 > ```
 
+r[items.extern.attributes.link_ordinal.syntax]
+The syntax for the `link_ordinal` attribute is:
+
+```grammar,attributes
+@root LinkOrdinalAttribute -> `link_ordinal` `(` LinkOrdinal `)`
+
+LinkOrdinal -> DEC_LITERAL | BIN_LITERAL | OCT_LITERAL | HEX_LITERAL
+```
+
+r[items.extern.attributes.link_ordinal.max]
+The ordinal must be less than or equal to [`u16::MAX`].
+
+r[items.extern.attributes.link_ordinal.allowed-positions]
+The `link_ordinal` attribute may be specified on a function or static in an `extern` block.
+
+r[items.extern.attributes.link_ordinal.duplicates]
+The `link_ordinal` attribute may only be specified once on an item.
+
 r[items.extern.attributes.link_ordinal.allowed-kinds]
-This attribute is only used with the `raw-dylib` linking kind. Using any other kind will result in a compiler error.
+The `link_ordinal` attribute may only be used with the [`raw-dylib` linking kind][items.extern.attributes.link.raw-dylib].
 
-r[items.extern.attributes.link_ordinal.exclusive]
-Using this attribute with the `link_name` attribute will result in a compiler error.
+r[items.extern.attributes.link_ordinal.link_name]
+The `link_ordinal` attribute may not be used with the [`link_name`] attribute.
 
 r[items.extern.attributes.fn-parameters]
 ### Attributes on function parameters
@@ -456,3 +474,4 @@ restrictions as [regular function parameters].
 [statics]: static-items.md
 [unwind-behavior]: functions.md#unwinding
 [value namespace]: ../names/namespaces.md
+[`link_name`]: items.extern.attributes.link_name