"Image filename is accessible name for image" (9eb3f6): Fix examples

[Jym77]

Fix the examples: add missing leading / and correct media queries.

Closes issue(s):

• closes Image filename is accessible name for image - problems with examples #1390
  Need for Final Call:
  This will require a 1 week Final Call (updating 3 examples).

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[dd8]

Yep, looks good

[Jym77]

Final Call ends on July 31st.