Merge pull request #1860 from AndrejMitrovic/Fix9185_2

[trivial] Issue 9184 - Document -op better.

src/mars.c

@@ -363,7 +363,7 @@ Usage:\n\
   -o-            do not write object file\n\
   -odobjdir      write object & library files to directory objdir\n\
   -offilename    name output file to filename\n\
-  -op            do not strip paths from source file\n\
+  -op            preserve source path for output files\n\
   -profile       profile runtime performance of generated code\n\
   -property      enforce property syntax\n\
   -quiet         suppress unnecessary messages\n\