Vladislav Zavialov authored Aug 04, 2020 and Marge Bot committed Aug 06, 2020

This patch started as a small documentation change, an attempt to make
Note [Parser-Validator] and Note [Ambiguous syntactic categories]
more clear and up-to-date.

But it turned out that runECP_P/runECP_PV are weakly motivated,
and it's easier to remove them than to find a good rationale/explanation
for their existence.

As the result, there's a bit of refactoring in addition to
a documentation update.