doc: convert Intel license headers to SPDX tags

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

doc: fix spellings

Fix various spellings in rst docs.

Signed-off-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

doc: restructure release notes

Restructured the Release Notes documentation into a more useful structure
that is easier to use and to update between releases.

The main changes are:

* Each releas

doc: restructure release notes

Restructured the Release Notes documentation into a more useful structure
that is easier to use and to update between releases.

The main changes are:

* Each release version has it's own section with New Features,
Resolved Issues, Known Issues and API/ABI Changes.
* Redundant sections have been removed.

Signed-off-by: John McNamara <john.mcnamara@intel.com>

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