Update Bitbucket importer docs
What does this MR do and why?
Updates BitBucket Server and BitBucket Cloud docs given the recent changes that were made.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #431182 (closed)
Edited by Madelein van Niekerk