Delete docs about wrap numbers and ECV
Delete docs about wrap numbers and ECV

This sentence is about ECV but nothing else in the docs discusses ECV
and it doesn't use that term. So it's actually kind of confusing; to me,
it suggested that asking for `1.2.3_1` might give you `1.2.3`, which is
not true.

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor