mp3_demo - Remove unused @brief entries and remove specific files from @file entries as doxygen uses the filename if the filename is not specified

examples/mp3_demo/main/audio.c

@@ -1,6 +1,5 @@
 /**
- * @file audio.c
- * @brief 
+ * @file
  * @version 0.1
  * @date 2021-12-06
  * 

examples/mp3_demo/main/include/audio.h

@@ -1,6 +1,5 @@
 /**
- * @file audio.h
- * @brief 
+ * @file
  * @version 0.1
  * @date 2021-11-11
  * 

examples/mp3_demo/main/include/ui_audio.h

@@ -1,6 +1,5 @@
 /**
- * @file ui_audio.h
- * @brief 
+ * @file
  * @version 0.1
  * @date 2021-11-11
  * 

examples/mp3_demo/main/mp3_demo.c

@@ -1,6 +1,5 @@
 /**
- * @file mp3_demo.c
- * @brief 
+ * @file
  * @version 0.1
  * @date 2021-11-11
  * 

examples/mp3_demo/main/ui_audio.c

@@ -1,7 +1,5 @@
 /**
- * @file ui_audio.c
- * @author your name ([email protected])
- * @brief 
+ * @file
  * @version 0.1
  * @date 2021-11-10
  *