Update role examples to use single quotes

[gitressa]

Fixes: #5324.

Problem

The user:password example uses double quotes:

$ drush user:password -h
Set the password for the user account with the specified name.

Examples:
 drush user:password someuser "correct horse battery staple"

... but you cannot use double quotes to create passwords containing special character (for example f!oobar12345) but have to use single quotes:

Strings in single quotes are not expanded by bash.

Otherwise you get an error:

$ drush user:password your.user "!foobar12345"
bash: !foobar12345: event not found

From https://superuser.com/questions/133780/in-bash-how-do-i-escape-an-exclamation-mark

Solution

Use single quotes.

To stay consistent, I updated the other instances in examples to use single quotes as well. Also, I noticed that a few examples were not correct, so I updated them as well.

[weitzman]

Thanks!

[gitressa]

Perfect, thanks for a fast response!