Add decoder paramater SEIPackedRegionsInfoFilename to software manual

doc/software-manual.tex

@@ -6768,6 +6768,12 @@ When a non-empty file name is specified, object mask information using the decod
 If no value is specified, the SEI message will not be output.
 \\
 
+\Option{SEIPackedRegionsInfoFilename} &
+%\ShortOption{\None} &
+\Default{\NotSet} &
+Packed regions info output file name. If empty, no object information will be saved.
+\\
+
 \end{OptionTableNoShorthand}