Update 2.15 release notes to mention new workflows

Create a new top level item "New Workflows".  Move the existing section
about private changes underneath it, and also add sections about the new
features: ignore, mute, and work-in-progress.

Change-Id: Icfeabd24dd9d2d0d6a11a974583237b4bfe78ab5
1 file changed
tree: da698a96f5153077d0f2738a71f38e20da61aec4
  1. docs/
  2. images/
  3. releases/
  4. about.md
  6. index.md
  7. issues.md
  8. navbar.md
  9. README.md

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