Correct some occurrences of "occured" (#1213)

* Correct all occurrences of "occured"

* Correct some occurrences of "occured"

fusee/fusee-primary/src/exception_handlers.c

@@ -89,7 +89,7 @@ void exception_handler_main(uint32_t *registers, unsigned int exception_type) {
     uint32_t cpsr = registers[16];
     uint32_t instr_addr = pc + ((cpsr & 0x20) ? 2 : 4) - CODE_DUMP_SIZE;
 
-    sprintf(exception_log, "An exception occured!\n");
+    sprintf(exception_log, "An exception occurred!\n");
     
     code_dump_size = safecpy(code_dump, (const void *)instr_addr, CODE_DUMP_SIZE);
     stack_dump_size = safecpy(stack_dump, (const void *)registers[13], STACK_DUMP_SIZE);