docs: Clarify that Ubuntu is just an example of a supported distro

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

docs/openharmony-quick-build.rst

@@ -19,7 +19,7 @@ of OpenHarmony on a real hardware, checkout the :ref:`Avenger96 support page
 Prerequisites
 *************
 
-Have a **Ubuntu 20.04 LTS** host with all the required host packages.
+Install all the required host packages. Here is an example for **Ubuntu**:
 
 .. code-block:: console
 
@@ -28,11 +28,14 @@ Have a **Ubuntu 20.04 LTS** host with all the required host packages.
     xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev \
     pylint3 xterm 
 
+See `official Yocto documentation <https://www.yoctoproject.org/docs/latest/ref-manual/ref-manual.html#required-packages-for-the-build-host>`_
+for host package requirements on all supported Linux distributions.
 
 Clone build system repositories
 *******************************
 
-Install Google git repo tool:
+Install Google git repo tool. For example, on **Ubuntu 20.04**, you can do this
+by:
 
 .. code-block:: console
 

docs/repo-workspace.rst

@@ -17,11 +17,13 @@ building OpenHarmony and developing on top.
 The Repo Tool
 *************
 
-OpenHarmony provides a patched version of the repo tool published as a
-`launchpad PPA <https://launchpad.net/~openharmony/+archive/ubuntu/tools>`_.
-The patches are also available in the tool's `source repository <https://git.ostc-eu.org/OSTC/packaging/git-repo>`_.
+In order to setup a sources workspace of OpenHarmony, the ``git-repo`` tool is
+required on the host.
 
-Install this tool by following the next steps:
+For ``Ubuntu 20.04``, OpenHarmony provides a patched version of the repo tool
+published as a `launchpad PPA <https://launchpad.net/~openharmony/+archive/ubuntu/tools>`_.
+The patches are also available in the tool's `source repository <https://git.ostc-eu.org/OSTC/packaging/git-repo>`_.
+One can install this tool by following the next steps:
 
 .. code-block:: console