MIPS16/opcodes: Add `-M no-aliases' disassembler option help text

Complement commit 986e18a5a9 ("Add a second 'pinfo' member to
mips_opcode to extend number of available bits"),
<https://sourceware.org/ml/binutils/2005-01/msg00261.html>, and add a
help text for the `-M no-aliases' disassembler option.

	opcodes/
	* mips-dis.c (print_mips_disassembler_options): Add
	`no-aliases'.

opcodes/mips-dis.c

@@ -2433,6 +2433,9 @@ print_mips_disassembler_options (FILE *stream)
 The following MIPS specific disassembler options are supported for use\n\
 with the -M switch (multiple options should be separated by commas):\n"));
 
+  fprintf (stream, _("\n\
+  no-aliases               Use canonical instruction forms.\n"));
+
   fprintf (stream, _("\n\
   msa                      Recognize MSA instructions.\n"));