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/introduction/readme.rst b/docs/introduction/readme.rst
index c90f8ce..a628879 100644
--- a/docs/introduction/readme.rst
+++ b/docs/introduction/readme.rst
@@ -87,10 +87,10 @@
     - Follow the :doc:`SW requirements guide </docs/getting_started/tfm_sw_requirement>`
       to set up your environment.
     - Follow the
-      :doc:`Build instructions </docs/getting_started/tfm_build_instruction>` to compile
-      and build the TF-M source.
-    - Follow the :doc:`User guide </docs/getting_started/tfm_user_guide>` for information
-      on running the example.
+      :doc:`Build instructions </docs/technical_references/instructions/tfm_build_instruction>`
+      to compile and build the TF-M source.
+    - Follow the :doc:`Run TF-M examples on Arm platforms </docs/technical_references/instructions/tfm_run_instruction>`
+      for information on running the example.
 
 To port TF-M to a another system or OS, follow the
 :doc:`OS Integration Guide </docs/integration_guide/tfm_integration_guide>`