Address comments made in PR104552 about documented D language options.
gcc/d/ChangeLog:
PR translation/104552
* lang.opt (fdump-cxx-spec=): Fix typo in argument handle.
(fpreview=fixaliasthis): Quote `alias this' as code.
fdump-c++-spec=
D RejectNegative Joined
--fdump-cxx-spec=<filename> Write all declarations as C++ code to <file>.
+-fdump-cxx-spec=<filename> Write all declarations as C++ code to <filename>.
fdump-d-original
D
fpreview=fixaliasthis
D RejectNegative
-When a symbol is resolved, check alias this scope before going to upper scopes.
+When a symbol is resolved, check `alias this' scope before going to upper scopes.
fpreview=in
D RejectNegative