Remove a comment that is taken from gdb man page.
Remove a comment that is taken from gdb man page.

This is not an original comment but taken from gdb man page, so
a pointer to the original document should suffice.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@298964 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld