doc: Add mention about new supported Renesas M32C architecture
doc: Add mention about new supported Renesas M32C architecture

Change-Id: Idbae1dcc9223bbc975c7139d1d3f994dc66a4ea4
Reviewed-by: Leena Miettinen <885fda02d52616fec24ed5fed9b3f0568fce3ead@qt.io>
Reviewed-by: Ivan Komissarov <96f14e4d07227e958f51f7d2898113639e9498d9@gmail.com>
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

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