Doxygen: Amend minor issues (#2593)

Corrects a few issues with regards to Doxygen documentation, for example:

- Incorrect parameter referencing.
- Missing @param tags.
- Typos in @param tags.

and a few minor other issues.

src/core/gdbstub/gdbstub.cpp

@@ -230,6 +230,7 @@ static void GdbHexToMem(u8* dest, const u8* src, size_t len) {
  * Convert a u32 into a gdb-formatted hex string.
  *
  * @param dest Pointer to buffer to store output hex string characters.
+ * @param v    Value to convert.
  */
 static void IntToGdbHex(u8* dest, u32 v) {
     for (int i = 0; i < 8; i += 2) {