Rewording of 3.1 rationale

Current wording:

Rationale: Appropriate assistance should increase the likelihood that 
typical authors will create content that conforms  to WCAG. Different 
tool developers will accomplish this goal in ways that are 
appropriate to their products, processes, and authors.

  JT: Appropriate assistance should increase the likelihood that 
typical  authors will create content that conforms to WCAG. This 
assistance should help to prevent the author from making decisions or 
omissions  that cause accessibility problems. If accessibility 
problems are prevented,  less effort is required to create content 
that conforms to WCAG. Different  tool developers will accomplish 
this goal in ways that are appropriate  to their products, processes, 
and authors.

Proposed rewording:
Less effort is required to author content that conforms to WCAG when 
accessibility problems are prevented rather than corrected. Different 
tool developers will help prevent authors from making decisions or 
omissions that cause accessibility problems in ways that are 
appropriate to their products, processes, and authors.

Jutta