Typo: 06-Multivariate-Kalman-Filters

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Under the section 'How Velocity is Calculated', the author writes:

"The prediction $\bar{x}$ was computed as $x + \bar{x} \Delta t$"

I believe the prior $\bar{x}$ on the right hand side of the equation should be replaced with the posterior state value for velocity $\dot{x}$ as follows:

"The prediction $\bar{x}$ was computed as $x + \dot{x} \Delta t$"