docs: Fix indentation on !!! warn section (#36254)

Related to #35526. Thanks to @kimikage for the heads up.

Author: cmcaine

doc/src/manual/types.md

@@ -237,12 +237,12 @@ of function arguments that are containers of abstract types; see [Performance Ti
 ## Primitive Types
 
 !!! warning
-  It is almost always preferable to wrap an existing primitive type in a new
-  composite type than to define your own primitive type.
+    It is almost always preferable to wrap an existing primitive type in a new
+    composite type than to define your own primitive type.
 
-  This functionality exists to allow Julia to bootstrap the standard primitive
-  types that LLVM supports. Once they are defined, there is very little reason
-  to define more.
+    This functionality exists to allow Julia to bootstrap the standard primitive
+    types that LLVM supports. Once they are defined, there is very little reason
+    to define more.
 
 A primitive type is a concrete type whose data consists of plain old bits. Classic examples of primitive
 types are integers and floating-point values. Unlike most languages, Julia lets you declare your