Ab Initio Reconstruction guide page update

Hello CryoSPARC users!

We have updated the job page on ab initio reconstruction to provide more detail about the impacts of various parameters in that job.

We have also added a detailed explanation of both Branch and Bound and Stochastic Gradient Descent to this page. These algorithms are both used throughout CryoSPARC, so a deeper understanding of how it works in ab initio reconstruction will help users understand CryoSPARC refinements in general.

As this is typically the first 3D job a user ever runs, we hope that this improved documentation makes the jump to the third dimension smoother!