Docs: Refine tfm_run_instruction.rst name

Rename 'tfm_run_instruction.rst' to
'run_tfm_examples_on_arm_platforms.rst' to reflect the content better.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I0ae23907ab05fe08ba191bb123507d53a7af48e1
diff --git a/docs/introduction/readme.rst b/docs/introduction/readme.rst
index a628879..2e67961 100644
--- a/docs/introduction/readme.rst
+++ b/docs/introduction/readme.rst
@@ -89,7 +89,7 @@
     - Follow the
       :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>`
+    - Follow the :doc:`Run TF-M examples on Arm platforms </docs/technical_references/instructions/run_tfm_examples_on_arm_platforms>`
       for information on running the example.
 
 To port TF-M to a another system or OS, follow the