fix some help text references

src/m68kdasm.cc

@@ -88,10 +88,10 @@ Options:\n\
       dump or editor.\n\
   --assemble-ppc32\n\
       Assemble the input text (from a file or from stdin) into PowerPC machine\n\
-      code. Note that resource_dasm expects a nonstandard syntax for memory\n\
+      code. Note that m68kdasm expects a nonstandard syntax for memory\n\
       references, which matches the syntax produced in code disassembled by\n\
-      resource_dasm. The raw assembled code is written to stdout or to the\n\
-      output file. If no output filename is given and stdout is a terminal, a\n\
+      m68kdasm. The raw assembled code is written to stdout or to the output\n\
+      file. If no output filename is given and stdout is a terminal, a\n\
       hex/ASCII view of the assembled code is written to the terminal instead\n\
       of raw binary.\n\
 \n", stderr);