storage: update android and swift storage category with multiple buckets support (#7918)

* update android storage with multi-bucket support

* feat(Storage)[Swift]: Adding documentation for multi-bucket support

* Fixing some typos and headers levels

* Listing all swift options for all APIs

* Fixing bucket description in download options for swift

* update android storage api with options list

* update android storage options

* remove options from download and remove APIs

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Co-authored-by: Sebastian Villena <[email protected]>

Author: phantumcode