Superscript usage is not allowed by WCAG

AFFECTS:

• xwiki:Help.Applications.Contributors.Frank Capra
• xwiki:Help.Applications.Contributors.Charlie Chaplin

ERROR:

• org.xwiki.test.webstandards.CustomDutchWebGuidelinesValidationTest.Validating HTML5 Dutch Web Guidelines validity for: xwiki:Help.Applications.Contributors.Frank Capra executed with credentials Admin:admin (from org.xwiki.test.webstandards.AllTests)
• ERROR: The use of <sup> is not allowed.

INVALIDATES:

• Dutch Guidelines: validateRpd3s9()
  • https://github.com/xwiki/xwiki-platform/blob/master/xwiki-platform-tools/xwiki-platform-tool-standards-validator/src/main/java/org/xwiki/validator/DutchWebGuidelinesValidator.java#L512
• R-pd.3.9 "Avoid using the sup (superscript) and sub (subscript) element if possible."

FIXES:

• VAR1: Remove the superscript usage
• VAR2: Make exceptions for those particular pages.