[UX][Bug] docs: OpenHarmony SDK - missing link to install OpenHarmony source repository

The module affected

https://docs.oniroproject.org/en/latest/meta-openharmony/supported-technologies/openharmony-sdk.html#usage

What is the action to reproduce the bug? (Steps to reproduce)

1. Go to Usage section docs/supported-technologies/openharmony/openharmony SDK/Usage
2. Try to o install the oniro-openharmony-bundle using guide procedures

What is the result you see? (Actual result)

tar xfz $DOWNLOADS/code-v3.0.1-LTS.tar.gz
cd code-v3.0.1-LTS/OpenHarmony
$DOWNLOADS/oniro-openharmony-bundle-3.0-cortexa7-neon-vfpv4-1.99.99.sh -y -d oniro
./oniro/setup.sh

What is the result you expect? (Expected behaviour)

1. Please add link/instruction how to download code-v3.0.1-LTS.tar.gz
2. Please clarify isntruction about install OpenHarmony source repository

Frequency? (always, sometimes, one-time issue)

Always

Tested version (image name and version, platform)

Kirkstone

Do you know any workaround of this issue? (link to workaround/mitigation steps etc)

n/a

Do you have a fix for this issue?

n/a