Add doxygen compatible documentation for enums

Author: sebromero

src/Arduino_POSIXStorage.h

@@ -89,20 +89,20 @@
 
 enum DeviceNames : uint8_t
 {
-  DEV_SDCARD,
-  DEV_USB
+  DEV_SDCARD, ///< SD Card
+  DEV_USB    ///< USB Thumb Drive
 };
 
 enum FileSystems : uint8_t
 {
-  FS_FAT,
-  FS_LITTLEFS
+  FS_FAT, ///< FAT file system
+  FS_LITTLEFS ///< LittleFS file system
 };
 
 enum MountFlags : uint8_t
 {
-  MNT_DEFAULT,
-  MNT_RDONLY    // Read only
+  MNT_DEFAULT, ///< Default mount mode
+  MNT_RDONLY   ///< Read only mode
 };
 
 /*