[docs] LibraryEvolution: Be more precise about "public".
[docs] LibraryEvolution: Be more precise about "public".

...as Slava pointed out, many times it means "versioned". I chose to
leave several things as "non-public, non-versioned" even though "non-
versioned" is sufficient (a versioned library may not have unversioned
public API) because "non-public" is something people instinctively
understand.

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