Update documentation for simplified report modal

[fergie-nz]

Update docs to match new report modal look:

Wording has been changed and non default fields are removed.
Also search functionality for code and name (and codeOrName) fields will be startsWith rather than Like.

See omSupply PR for details: https://github.com/msupply-foundation/open-msupply-reports/pull/93

[jmbrunskill]

@fergie-nz can you pick this one up when you get a chance?