[Help document bug] For imgcmp, the help document misses some options

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The "--help" option of imgcmp misses the option "min", "max", "d“，"memory-limit", and "verbose" for version 3.0.6.

• For the option "min", the following code appears during option parsing and modifies the minonly in src/app/imgcmp.c:203-204 for version 3.0.6.

			minonly = 1;
			break;

• For the option "max", the following code appears during option parsing and modifies the maxonly in src/app/imgcmp.c:200-201 for version 3.0.6.

			maxonly = 1;
			break;

• For the option "d", the following code appears during option parsing and modifies the diffpath in src/app/imgcmp.c:218-219 for version 3.0.6.

			diffpath = jas_optarg;
			break;

• For the option "memory-limit", the following code appears during option parsing and modifies the max_mem in src/app/imgcmp.c:225-226 for version 3.0.6.

			max_mem = strtoull(jas_optarg, 0, 10);
			break;

• For the option "verbose", the following code appears during option parsing and modifies the verbose in src/app/imgcmp.c:215-216 for version 3.0.6.

			verbose = 1;
			break;

But they do not appear in the document provided by "--help".

It may prevent users from using the relevant function.