User documentation

[maxime-rainville]

Story

As a CMS User I want to have access to documentation so that I understand how to use the link field.

Acceptance criteria

• User help has been updated with reference to the link field.
• User help covers basic functionality
  • Creating/updating/archiving single links
  • Creating/updating/archiving/reordering link list
  • Default link text behavior is highlighted
  • How to create Page link is explained in greater details (since it contains more complex options)
• Screen shots of the fields are added where relevant.
• LinkField user helps mentions that the available link types may vary based on developer customisation.
• LinkField user helps adheres to guidance in Silverstripe Writing Style Guide, especially the Writing for the web part.
• User help docs are not pulled through the developer docs.

PRs

• ENH Add Linkfield user docs doc.silverstripe.org#287
• DOC Link field User manual #234

[GuySartorelli]

PRs merged.