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

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

(cherry picked from commit 6e7bc68)

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