Clarify date format options

[ldust667]

The man page for the command "date" needs updated to clarify a "+" is needed before the format arguments.

For example it lists: date [OPTION]... [+FORMAT]

But no example later on that specifies "+" needs included before the listed format options. Moving the "+" outside the brackets and providing an example could further clarify.

I believe this is the correct location but I can't seem to locate the man page for this command to push corrections.