docs: Ensure all parameters in the documentation have a type and a description (#1345)

* Add descriptions for some query parameters

* Eliminate the extra space

* Add a description to all the alias parameters

* Add documentation for property parameters

* Add descriptions for the aggregation argument

* Add property params to these objects

* Add descriptions for data types

* Fix the broken links

* Add documentation for the addExcludeFromIndexes

* Buffer description

* Add a description for entity filters

* Add parameters documentation for the `and` and `or

* Add descriptions for the filter object

* Add some parameter documentation for the client

* Parameter for prepareGaxRequest_

* Add documentation to a few of the helper functions

* Add more documentation for txn and request params

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Kevin Kim <kevkim@google.com>