Typo in AnalyticPhase documentation

[robfalck]

Task Description

The documentation here: https://openmdao.github.io/dymos/features/phases/analytic_phases.html#different-ways-to-handle-the-phase-linkage-for-state-continuity

Indicates that we can link the two phases together with a constraint, rather than directly connecting them. But then the example given indicates that they are in fact connected.

Valid options here would be to link the states together with unconnected phases, using a constraint:

traj.link_phases(['first_phase', 'second_phase'], ['x'], connected=True)

Should be

Valid options here would be to link the states together with unconnected phases, using a constraint:

traj.link_phases(['first_phase', 'second_phase'], ['x'], connected=False)