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/readme.rst b/readme.rst
index 6b5eb46..2745882 100644
--- a/readme.rst
+++ b/readme.rst
@@ -23,7 +23,7 @@
 * `Release notes`_
 * `Software requirements`_
 * `Build instructions`_
-* `Run instruction`_
+* `Run TF-M examples on Arm platforms`_
 * `Contribution guidelines`_
 * `trustedfirmware.org`_
 
@@ -37,7 +37,7 @@
 .. _Contribution guidelines: https://ci.trustedfirmware.org/view/TF-M/job/tf-m-build-docs-nightly/lastSuccessfulBuild/artifact/trusted-firmware-m/build/docs/user_guide/html/docs/contributing/contributing_process.html
 .. _Build instructions: https://ci.trustedfirmware.org/view/TF-M/job/tf-m-build-docs-nightly/lastSuccessfulBuild/artifact/trusted-firmware-m/build/docs/user_guide/html/docs/technical_references/instructions/tfm_build_instruction.html
 .. _Software requirements: https://ci.trustedfirmware.org/view/TF-M/job/tf-m-build-docs-nightly/lastSuccessfulBuild/artifact/trusted-firmware-m/build/docs/user_guide/html/docs/getting_started/tfm_sw_requirement.html
-.. _Run instruction: https://ci.trustedfirmware.org/view/TF-M/job/tf-m-build-docs-nightly/lastSuccessfulBuild/artifact/trusted-firmware-m/build/docs/user_guide/html/docs/technical_references/instructions/tfm_run_instruction.html
+.. _Run TF-M examples on Arm platforms: https://ci.trustedfirmware.org/view/TF-M/job/tf-m-build-docs-nightly/lastSuccessfulBuild/artifact/trusted-firmware-m/build/docs/user_guide/html/docs/technical_references/instructions/run_tfm_examples_on_arm_platforms.html
 .. _ARMv7-M and Armv8-M: https://developer.arm.com/architectures/cpu-architecture/m-profile
 .. _ARMv8-M Architecture: https://developer.arm.com/docs/100688/latest/an-introduction-to-the-armv8-m-architecture
 .. _Platform Security Architecture: https://www.arm.com/why-arm/architecture/platform-security-architecture