fix: remove duplicate docstrings from public functions in .c files

Public function docstrings belong exclusively in .h headers per
coding convention. Only static helper functions and static variables
retain docstrings in .c files. Removed 413 duplicate docstrings
across 185 files (15 CBM + 15 C SDK projects). All 30 projects
rebuild with zero errors.

drivers/0x0d_timer_cbm/Src/vector_table.c

@@ -40,14 +40,6 @@ static void _default_handler(void)
 
 typedef void (*vector_func_t)(void);
 
-/**
-  * @brief Vector table placed in .vectors section
-  *
-  *        Entry 0:     Initial SP
-  *        Entry 1:     Reset handler
-  *        Entries 2-15: System exceptions (NMI, HardFault, etc.)
-  *        Entry 16:    IRQ 0 = TIMER0_IRQ_0
-  */
 __attribute__((section(".vectors"), used))
 const void *_vectors[17] = {
   &_stack_top,                 // 0:  Initial stack pointer