Docs improvements

[flanagansteve]

• In the swagger docs, reword the description here:

name: 'options'
description: 'Options DEX endpoints'

to "Options endpoints"

• Rename subgraphURL / subgraphAPIURL in the config to panopticSubgraphUrl, or some other name that reflects that it has data about the Panoptic protocol and Uniswap
• In the swagger docs:
  • Reword the /addLeg description - "summary: 'Create a position leg on tokenId'" - to "summary: 'Add a leg to a position (including initialising a position with its first leg)"
  • Update descriptions of any methods such as getCollateralToken0 to note that it will call the method on the supplied panoptic pool - currently they just say things like "gets collateral token0" which only makes sense if you have a hard-coded PanopticPool (which will change)