[HUST CSE][document] Fix some comments, invalid grouping commands and warnings in Doxygen.

将Doxygen输入文件（由Doxyfile中的INPUT定义）中的失效Doxygen分组指令（如/*@*/和/*@}*/）更改为有效的分组指令（如/**@*/和/**@}*/）；（此处只对INPUT中的文件做了修改，bsp目录下和libcpu目录下存在近万个失效的Doxygen分组指令，但由于不作为文档的输入文件且这些文件过于庞大老旧，没有对这些文件中的无效指令做修改）
将图片文件统一放入了images目录下；
修改了Doxyfile和部分Doxygen注释，使得Doxyfile能够定位到新的代码路径且不受重复实现的影响；
解决了一些注释中的参数名不匹配、参数多余/缺失等问题。

1 files changed, 4 insertions, 0 deletions

diff --git a/src/components.c b/src/components.c
index 809ca72a1d..97ace80990 100644
--- a/src/components.c
+++ b/src/components.c
@@ -174,6 +174,8 @@ struct rt_thread main_thread;
  * @brief  The system main thread. In this thread will call the rt_components_init()
  *         for initialization of RT-Thread Components and call the user's programming
  *         entry main().
+ *
+ * @param  parameter is the arg of the thread.
  */
 void main_thread_entry(void *parameter)
 {
@@ -228,6 +230,8 @@ void rt_application_init(void)
 /**
  * @brief  This function will call all levels of initialization functions to complete
  *         the initialization of the system, and finally start the scheduler.
+ *
+ * @return Normally never returns. If 0 is returned, the scheduler failed.
  */
 int rtthread_startup(void)
 {