doc: Update the legacy MSYS2 environment to use 2019r2 toolchain version

As reported at https://www.esp32.com/viewtopic.php?p=52805
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Angus Gratton 2019-12-20 18:52:21 +11:00 committed by bot
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@ -16,7 +16,7 @@ Toolchain Setup
The quick setup is to download the Windows all-in-one toolchain & MSYS2 zip file from dl.espressif.com:
https://dl.espressif.com/dl/esp32_win32_msys2_environment_and_toolchain-20190611.zip
https://dl.espressif.com/dl/esp32_win32_msys2_environment_and_gcc8_toolchain-20191231.zip
Unzip the zip file to ``C:\`` (or some other location, but this guide assumes ``C:\``) and it will create an ``msys32`` directory with a pre-prepared environment.