[prdoc] Update docs (#3998)
Updating the prdoc doc file to be a bit more useful for new contributors
and adding a SemVer section.
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Signed-off-by: 
Oliver Tale-Yazdi <[email protected]>
Updating the prdoc doc file to be a bit more useful for new contributors
and adding a SemVer section.
---------
Signed-off-by: Oliver Tale-Yazdi <[email protected]>