Docs: update new libdefs minimum Flow version (#3954)
Docs: update new libdefs minimum Flow version (#3954)

We want to explicitly use either exact or inexact objects for all new definitions.
Since the inexact object syntax was added in Flow 0.83.x, it does not make sense to keep scoping new libdef to 0.25.x?
Anyway, we only test the last 15 versions...
flowtype/flow-typed,splodingsocks/FlowTyped,flowtype/flow-typed,splodingsocks/FlowTyped