Merge bitcoin/bitcoin#24467: doc: minor improvements in getutxos REST endpoint synopsis

c456302d4258e3abc4b8afde20fba808632771b2 doc: minor improvements in getutxos REST endpoint synopsis (Sebastian Falbesoner)

Pull request description:

  Describing an optional sub-path as `<checkmempool>` in the synopsis could be misleading as the angle brackets normally indicate that the field has to be replaced a custom value. Clarify that by showing two variants instead, similar to the `block` endpoint with the `notxdetails` option:
  ```
  #### Blocks
  `GET /rest/block/<BLOCK-HASH>.<bin|hex|json>`
  `GET /rest/block/notxdetails/<BLOCK-HASH>.<bin|hex|json>`
  ```

  Further improvements:
  - uppercase `<TXID>` and `<N>`, to match the description of the other endpoints
  - s/getutxo command/getutxos endpoint/
  - describe what the `checkmempool` option does
  - s/serialisation/serialization/ (the US spelling is more dominant than the UK spelling in the project, and there is indeed no other instance of the string "serialis*" in the source tree, except once in a release note)
  - link to BIP64 within the text instead of only showing bare URL
  - mention that BIP64 is only relevant for `bin` and `hex` output formats
  - show two endpoint formats of the block section as list

ACKs for top commit:
  stickies-v:
    ACK c456302d4258e3abc4b8afde20fba808632771b2 - also checked that current master (cc12b8947) doesn't have any other lines changes that would require updates as per the outlined improvement points.

Tree-SHA512: b025aac0812397f5fbf78c805c13aeb5afa6862a049d13c0b101178799cdaff1ccd3abc368a5c103ea6ebf17cdff76584c54638d0f8d303d81ade2d71443d305

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