[Bug other/58467] Documentation of the "used" variable attribute needs additional information

[psmith at gnu dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58467

--- Comment #6 from Paul Smith <psmith at gnu dot org> ---
A minor typo:

- attached to a variable with the static storage,
+ attached to a variable with static storage,

Also, I wonder if it might be helpful to be clear that it can ONLY be applied
to variables with static storage, or else you get a warning/error.  That would
require more substantial changes to the text though.

Cheers!