docs: difference between coreos & spec API

[sadlerap]

Explicitly documents the difference between the two APIs we support.

Signed-off-by: Andy Sadler [email protected]

Changes

/kind documentation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Docs
  included if any changes are user facing
• Tests
  included if any functionality added or changed. For bugfixes please include tests that can catch regressions
• All acceptance test scenarios included in the PR which verifies a bugfix or a requested feature reported by a non-member are tagged with @external-feedback tag.
• Follows the commit message standard

[codecov]

Codecov Report

Merging #1220 (80027f0) into master (8563a7c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1220   +/-   ##
=======================================
  Coverage   58.05%   58.05%           
=======================================
  Files          33       33           
  Lines        2844     2844           
=======================================
  Hits         1651     1651           
  Misses       1032     1032           
  Partials      161      161           

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[pmacik]

/lgtm
/approve

[openshift-ci]

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