[Bug c++/92743] New: doc: -Wattribute-alias improperly indexed

[akim.demaille at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92743

            Bug ID: 92743
           Summary: doc: -Wattribute-alias improperly indexed
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: akim.demaille at gmail dot com
  Target Milestone: ---

The documentation indexes the option with the leading `-`, contrary to the rest
of the documentation.

See
https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Option-Index.html#Option-Index.