Update v3 directive example to have quoted string #634
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Description of Problem
Users are copying example from directives docs and getting into a problem where the directive doesn't seem to be working.
Proposed Solution
Use a string in the example
Additional Information
I've seen this cause confusion several times. The examples don't show a variable
yellow
defined, and because a string is expected the example, as is, will fail. I believe adding the extra'
quotes will make it clearer, and for anyone copy-pasting won't cause issues. Alternatively, the variable could be shown, but that would make examples longer.