infra/download_source: update toolchain download instructions

The toolchain version is being moved from 8.3 to 10.2. Update the
toolchain download and setup instructions accordingly.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: Ifb128b8729a924e65a86a286ac6ce733131a31c4

docs/infra/common/download-sources.rst

@@ -145,12 +145,12 @@ workspace.
   cd tools/gcc
 
   # Download the toolchain from developer.arm.com
-  wget https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-arm-eabi.tar.xz
-  wget https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu.tar.xz
+  wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
+  wget https://developer.arm.com/-/media/Files/downloads/gnu-a/10.2-2020.11/binrel/gcc-arm-10.2-2020.11-x86_64-aarch64-none-linux-gnu.tar.xz
 
   # Extract the toolchain
-  tar -xvJf gcc-arm-8.3-2019.03-x86_64-arm-eabi.tar.xz
-  tar -xvJf gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu.tar.xz
+  tar -xf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
+  tar -xf gcc-arm-10.2-2020.11-x86_64-aarch64-none-linux-gnu.tar.xz
 
   cd ../..