I have created the initial draft of a new StarlingX guide called
"Documentation Contributor Guide". The guide lives alongside
the existing StarlingX contributor guides. This involved an
update to the contributor folder's "index.rst" file and a new
content file named stx-docs/doc/source/doc_contribute_guide.rst".
Change-Id: I54adedb520869bed462dfee30098404a09dfca8e
Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
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