New -read_speed prefixes "soft_force:" and "soft_corr:"

xorriso/opts_d_h.c

@@ -1779,9 +1779,10 @@ int Xorriso_option_help(struct XorrisO *xorriso, int flag)
 "                 Enable or disable status and content changes of drive.",
 "  -scsi_dev_family \"default\"|\"sr\"|\"scd\"|\"sg\"",
 "                 Linux specific: Choose device file type.",
-"  -read_speed number[\"k/s\"|\"m/s\"|\"[x]CD\"|\"[x]DVD\"|\"[x]BD\"]",
+"  -read_speed number[\"k/s\"|\"[x]CD\"|\"[x]DVD\"|\"[x]BD\"]|keyword",
 "                 Set the read speed. Default is \"none\" = do not set speed",
-"                 before reading.",
+"                 before reading. Prefix \"soft_force:\" enables slowdown by",
+"                 software.",
 "  -grow_blindly \"off\"|predicted_nwa",
 "                 Switch between modifying and blind growing.",
 "  -load \"session\"|\"track\"|\"lba\"|\"sbsector\"|\"volid\"|\"auto\" id",