[llvm][Tablegen] Link to tutorial before programmer's reference

The natural assumption is that there's some sort of order here
and having people read the reference manual before the basic
tutorial does not make sense to me.

Author: DavidSpickett

llvm/utils/TableGen/README.md

@@ -33,8 +33,8 @@ that the backend developer needs.
 
 Resources for learning the language:
 * [TableGen Overview](https://llvm.org/docs/TableGen/index.html)
-* [Programmer's reference guide](https://llvm.org/docs/TableGen/ProgRef.html)
 * [Tutorial](jupyter/tablegen_tutorial_part_1.ipynb)
+* [Programmer's reference guide](https://llvm.org/docs/TableGen/ProgRef.html)
 * [Tools for Learning LLVM TableGen](https://blog.llvm.org/posts/2023-12-07-tools-for-learning-llvm-tablegen/)
 * [Lessons in TableGen](https://www.youtube.com/watch?v=45gmF77JFBY) (video),
   [slides](https://archive.fosdem.org/2019/schedule/event/llvm_tablegen/attachments/slides/3304/export/events/attachments/llvm_tablegen/slides/3304/tablegen.pdf)