doc: Update for SDK 0.12.4

Update docs to reference SDK 0.12.4 that is needed for the recent arm64
split.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

doc/getting_started/index.rst

@@ -292,14 +292,14 @@ to build Zephyr applications.
          .. code-block:: bash
 
             cd ~
-            wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.12.3/zephyr-sdk-0.12.3-x86_64-linux-setup.run
+            wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.12.4/zephyr-sdk-0.12.4-x86_64-linux-setup.run
 
-      #. Run the installer, installing the SDK in :file:`~/zephyr-sdk-0.12.3`:
+      #. Run the installer, installing the SDK in :file:`~/zephyr-sdk-0.12.4`:
 
          .. code-block:: bash
 
-            chmod +x zephyr-sdk-0.12.3-x86_64-linux-setup.run
-            ./zephyr-sdk-0.12.3-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.3
+            chmod +x zephyr-sdk-0.12.4-x86_64-linux-setup.run
+            ./zephyr-sdk-0.12.4-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.4
 
          .. note::
             It is recommended to install the Zephyr SDK at one of the following locations:
@@ -312,7 +312,7 @@ to build Zephyr applications.
             * ``/usr/zephyr-sdk[-x.y.z]``
             * ``/usr/local/zephyr-sdk[-x.y.z]``
 
-            where ``[-x.y.z]`` is optional text, and can be any text, for example ``-0.12.3``.
+            where ``[-x.y.z]`` is optional text, and can be any text, for example ``-0.12.4``.
 
             If installing the Zephyr SDK outside any of those locations, please read: :ref:`zephyr_sdk`
 
@@ -323,7 +323,7 @@ to build Zephyr applications.
 
          .. code-block:: bash
 
-            sudo cp ~/zephyr-sdk-0.12.3/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d
+            sudo cp ~/zephyr-sdk-0.12.4/sysroots/x86_64-pokysdk-linux/usr/share/openocd/contrib/60-openocd.rules /etc/udev/rules.d
             sudo udevadm control --reload
 
    .. group-tab:: macOS

doc/getting_started/installation_linux.rst

@@ -240,19 +240,19 @@ Follow these steps to install the Zephyr SDK:
 
    .. code-block:: console
 
-      wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.12.3/zephyr-sdk-0.12.3-x86_64-linux-setup.run
+      wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.12.4/zephyr-sdk-0.12.4-x86_64-linux-setup.run
 
-   (You can change *0.12.3* to another version if needed; the `Zephyr
+   (You can change *0.12.4* to another version if needed; the `Zephyr
    Downloads`_ page contains all available SDK releases.)
 
 #. Run the installation binary, installing the SDK at
-   :file:`~/zephyr-sdk-0.12.3`:
+   :file:`~/zephyr-sdk-0.12.4`:
 
    .. code-block:: console
 
       cd <sdk download directory>
-      chmod +x zephyr-sdk-0.12.3-x86_64-linux-setup.run
-      ./zephyr-sdk-0.12.3-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.3
+      chmod +x zephyr-sdk-0.12.4-x86_64-linux-setup.run
+      ./zephyr-sdk-0.12.4-x86_64-linux-setup.run -- -d ~/zephyr-sdk-0.12.4
 
    You can pick another directory if you want. If this fails, make sure
    Zephyr's dependencies were installed as described in `Install Requirements
@@ -272,7 +272,7 @@ installed it.
    * ``/usr/zephyr-sdk[-x.y.z]``
    * ``/usr/local/zephyr-sdk[-x.y.z]``
 
-   where ``[-x.y.z]`` is optional text, and can be any text, for example ``-0.12.3``.
+   where ``[-x.y.z]`` is optional text, and can be any text, for example ``-0.12.4``.
 
    If you install the Zephyr SDK outside any of those locations, then it is
    required to register the Zephyr SDK in the CMake package registry during
@@ -283,7 +283,7 @@ installed it.
    containing multiple Zephyr SDKs, allowing for automatic toolchain selection,
    for example: ``ZEPHYR_SDK_INSTALL_DIR=/company/tools``
 
-   * ``/company/tools/zephyr-sdk-0.12.3``
+   * ``/company/tools/zephyr-sdk-0.12.4``
    * ``/company/tools/zephyr-sdk-a.b.c``
    * ``/company/tools/zephyr-sdk-x.y.z``