[llvm-objdump] Update the doc for --disassemble-functions.

[ychen]

Summary

Update the doc after llvm-svn: 364121 is landed.
With two more trivial fixes that are not related to
--disassemble-functions but still about llvm-objdump.

[jhenderson]

LGTM, with one suggestion.

llvm/docs/CommandGuide/llvm-objdump.rst

38–40

Perhaps worth changing "demangled symbols" to "demangled symbol names" and "mangled symbols" to "mangled symbol names".

[ychen]

• update

llvm/docs/CommandGuide/llvm-objdump.rst

.. option:: -d, --disassemble
   Display assembler mnemonics for the machine instructions. Disassembles all
   text sections found in the input file(s) by default.
 
 .. option:: -D, --disassemble-all
 
   Display assembler mnemonics for the machine instructions. Disassembles all
   sections found in the input file(s) by default.
   
-.. option:: --disassemble-functions=<func1[,func2,...]>
+.. option:: --disassemble-functions=<symbol1[,symbol2,...]>
 
-  Disassemble only the specified symbols. Implies :option:`--disassemble`.
+  Disassemble only the specified symbols. Takes demangled symbol names when
+  :option:`--demangle` is specified, otherwise takes mangled symbol names.
+  Implies :option:`--disassemble`.
 
 .. option:: --dwarf=<value>
 
   Dump the specified DWARF debug sections. The supported values are:
 
   `frames` - .debug_frame
 
 .. option:: -f, --file-headers

 
 .. option:: --adjust-vma=<offset>
 
   Increase the displayed address in disassembly or section header printing by
   the specified offset.
 
 .. option:: --arch-name=<string>
 
-  Specify the target architecture when disassembling. Use :option:``--version``
+  Specify the target architecture when disassembling. Use :option:`--version`
   for a list of available targets.
 
 .. option:: -C, --demangle
 
   Demangle symbol names in the output.
 
 .. option:: -j, --section=<section1[,section2,...]>
 
.. option:: --triple=<string>
   Target triple to disassemble for, see ``--version`` for available targets.
 
 .. option:: -w, --wide
 
   Ignored for compatibility with GNU objdump.
 
 .. option:: --x86-asm-syntax=<style>
 
-  When used with the ``--disassemble`` option, choose style of code to emit from
+  When used with :option:`--disassemble`, choose style of code to emit from
   X86 backend. Supported values are:
 
    .. option:: att
 
     AT&T-style assembly
 
    .. option:: intel