Updates to Hero and FCM pages

[jenn-franklin]

Changes

• Added max character counts
• Removed second image examples
• On the hero page, indicated use of "Lead paragraph" (Avenir Next Regular) for the subheading rather than H3 (Avenir Next Medium)
• Adjusted FCM layout in the desktop area to better accommodate the placement of only one visual example
• On the FCM page, removed the max height reference

  Review

@Scotchester @nataliafitzgerald

Links and Screenshots

Hero: https://huetingj.github.io/design-manual/ui-toolkit/heroes.html

FCM: https://huetingj.github.io/design-manual/ui-toolkit/featured-content-module.html

[jenn-franklin]

I just added links for viewing the code. No other changes on my end.

[Scotchester]

:+1: