minidebuginfo: ppc64 sync testcase->doc
    
    gdb/doc/
    2013-09-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
    
    	Sync documentation with gdb.base/gnu-debugdata.exp.
    	* gdb.texinfo (MiniDebugInfo): Add comment and "D" in the example.