[Docs] update download link cross-compilation instructions

docs/Cross-compilation.md

@@ -120,7 +120,7 @@ You can find ready-to-use toolchains with good compatibility at https://github.c
 ```sh
 # Create a directory to save the cross-compilation toolchains into
 mkdir -p toolchains
-# Download and extract the toolchain for AArch64
+# Download and extract the toolchain for AArch64 (~120 MiB)
 url="https://github.com/tttapa/toolchains/releases/download/0.1.0"
 wget "$url/x-tools-aarch64-rpi3-linux-gnu-gcc14.tar.xz" -O- | tar xJ -C toolchains
 # Verify that the toolchain works
@@ -137,9 +137,9 @@ You can download these from https://github.com/tttapa/python-dev.
 ```sh
 # The toolchain is read-only by default, make it writable to add Python to it
 chmod u+w "toolchains/x-tools/aarch64-rpi3-linux-gnu"
-# Download and extract the Python binaries for AArch64
-url="https://github.com/tttapa/python-dev/releases/download"
-wget "$url/0.2.0/python-dev-aarch64-rpi3-linux-gnu.tar.xz" -O- | tar xJ -C toolchains
+# Download and extract the Python binaries for AArch64 (~150 MiB)
+url="https://github.com/tttapa/python-dev/releases/download/0.0.2"
+wget "$url/python-dev-aarch64-rpi3-linux-gnu.tar.xz" -O- | tar xJ -C toolchains
 ```
 
 ### Inspect and customize the toolchain files and py-build-cmake configuration