Add Checkout & Account merchant block documentation (3 blocks) #640
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Purpose of this pull request
This PR adds merchant documentation for 3 Checkout & Account B2B blocks (Account Nav, Checkout Success, and Customer Company). All documentation was generated from the boilerplate b2b-suite-release1 branch with configurations extracted from source code and README files, enhanced property descriptions with contextual WHEN/WHY guidance, and Important Notes sections covering prerequisites and warnings.