Doxygenize the documentation comments

src/IceRegistersMIPS32.h

Index: src/IceRegistersMIPS32.h
diff --git a/src/IceRegistersMIPS32.h b/src/IceRegistersMIPS32.h
index d2180bf4fd129ee43a3384e4827e3714641f0916..227c8b1d46c06baf02e67c00436f268267d2088f 100644
--- a/src/IceRegistersMIPS32.h
+++ b/src/IceRegistersMIPS32.h
@@ -22,8 +22,8 @@ namespace Ice {
 
 namespace RegMIPS32 {
 
-// An enum of every register. The enum value may not match the encoding
-// used to binary encode register operands in instructions.
+/// An enum of every register. The enum value may not match the encoding
+/// used to binary encode register operands in instructions.
 enum AllRegisters {
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
           isFP)                                                                \
@@ -36,8 +36,8 @@ enum AllRegisters {
 #undef X
 };
 
-// An enum of GPR Registers. The enum value does match the encoding used
-// to binary encode register operands in instructions.
+/// An enum of GPR Registers. The enum value does match the encoding used
+/// to binary encode register operands in instructions.
 enum GPRRegister {
 #define X(val, encode, name, scratch, preserved, stackptr, frameptr, isInt,    \
           isFP)                                                                \