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
checkmempooloption 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
binandhexoutput formats - show two endpoint formats of the block section as list