Docs: Move build instruction and user guide into technical reference

Move build instruction document and user guide document from getting
started into technical references folder. Rename 'tfm_user_guide.rst'
to 'tfm_run_instruction.rst'. This will make the document structure
more clear for readers.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I69d46151f2cb97c828c1b82775ffd1af9032ed45
diff --git a/docs/integration_guide/tfm_integration_guide.rst b/docs/integration_guide/tfm_integration_guide.rst
index f6807e1..ccf206f 100644
--- a/docs/integration_guide/tfm_integration_guide.rst
+++ b/docs/integration_guide/tfm_integration_guide.rst
@@ -7,12 +7,12 @@
 *****************
 How to build TF-M
 *****************
-Follow the :doc:`Build instructions </docs/getting_started/tfm_build_instruction>`.
+Follow the :doc:`Build instructions </docs/technical_references/instructions/tfm_build_instruction>`.
 
 ********************************************************
 How to export files for building non-secure applications
 ********************************************************
-Explained in the :doc:`Build instructions </docs/getting_started/tfm_build_instruction>`.
+Explained in the :doc:`Build instructions </docs/technical_references/instructions/tfm_build_instruction>`.
 
 *************************
 How to add a new platform