Help: Organize and revise 3.15 release notes

Add section headers similar to the 3.14 release notes and move each individual bullet into an appropriate section. Revise a few bullets.

Help: Organize and revise 3.15 release notes
Add section headers similar to the 3.14 release notes and move each individual bullet into an appropriate section. Revise a few bullets.
4272297b · Brad King · 01d57304 · 4272297b
Commit 4272297b authored Jun 04, 2019 by Brad King
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Help/release/3.15.rst Help/release/3.15.rst +231 -209

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