Trivial updates, typos etc.
Created by: philarcher
Reading through and nit picking along the way. Only important changes are:
- referring to ISO/IEC 19987 when referring to EPCIS;
- adding reference to LEIs, with hyperlink, so we're not only linking to GS1 specs;
- "Linked Data" is a proper name of a specific technology so I have replaced "linked-data" with that title-case version.