doxygen: group name all in lowcase (part 1) #6605

Job	Run time
🔍 Summary of Git Diff Changes	35s
stm32_f2_f4	11m 32s
K230	1m 15s
RTduino_Arduino Libraries (Raspberry Pico)	8m 24s
at32_hc32_ht32	5m 6s
riscv-none	2m 52s
stm32f0_f1	5m 51s
stm32_f7_g0_h7_mp15_u5_h5_wb5	8m 23s
nuvoton	3m 29s
llvm-arm	4m 0s
mips	1m 7s
RT-Thread Online Packages (STM32F407 RT-Spark)	5m 23s
stm32l4	8m 30s
hpmicro	1m 3s
gd32_n32_apm32	3m 28s
others_ft32_mm32_acm32	3m 16s
simulator	57s
nxp_renesas	6m 5s
nordic(yml)	9m 30s
riscv64-unknown	1m 42s
arm-none-bsp-smart	2m 52s
xuantie-smart	57s
i386-unknown	58s
xuantie	2m 9s
ESP32C3	7m 2s
Infineon_TI_microchip	5m 41s
aarch64	1m 32s
collect-artifacts	0s
	1h 53m 39s

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