tools: Add/fix documentation

tools/README.md

@@ -25,6 +25,10 @@ With ``--qdirstat`` and a single elf file, generate a [qdirstat](https://github.
 This assumes the running firmware generating the dump and the elf file are the same.
 Requires Python3 and the [pyelftools](https://github.com/eliben/pyelftools) module.
 
+### ``dump2bin``
+
+Parse and decode a memory dump obtained from the D2/D21/D23 g-code into readable metadata and binary. The output binary is padded and extended to fit the original address range.
+
 ### ``update_eeprom``
 
 Given one EEPROM dump, convert the dump to update instructions that can be sent to a printer.

tools/elf_mem_map

@@ -344,7 +344,7 @@ def main():
     ap = argparse.ArgumentParser(description="""
         Generate a symbol table map starting directly from an ELF
         firmware with DWARF3 debugging information.
-        When used along with a memory dump obtained from the D2 g-code,
+        When used along with a memory dump obtained from the D2/D21/D23 g-code,
         show the value of each symbol which is within the address range.
     """)
     ap.add_argument('elf', help='ELF file containing DWARF debugging information')