Add #soa pointer type to aid with refactoring to #soa data types

a: #soa[16]Foo
p := &a[6]
#assert(type_of(p) == #soa^#soa[16]Foo)
p^.x = 123
p.x = 123

src/docs_format.cpp

@@ -83,6 +83,7 @@ enum OdinDocTypeKind : u32 {
 	OdinDocType_RelativeSlice    = 21,
 	OdinDocType_MultiPointer     = 22,
 	OdinDocType_Matrix           = 23,
+	OdinDocType_SoaPointer       = 24,
 };
 
 enum OdinDocTypeFlag_Basic : u32 {