Include a few more specific points in the documentation

[sarabodach]

• [x] --LNKID vs. --LINKID https://github.com/pharmaverse/sdtmchecks/blob/bfaa516b46ca4a02675d6959d2bcb938f9f22ccd/vignettes/faqs.Rmd#L72
• [x] other notes on Roche-specific differences with xxSPID
• [x] a vignette with search page or just a table in which you can cross-ref possible domains and see which have checks

[sarabodach]

Points about --LNKID vs. --LINKID added here: https://pharmaverse.github.io/sdtmchecks/articles/faqs.html#relationship-to-other-tools-and-data-standards

Roche --SPID: https://pharmaverse.github.io/sdtmchecks/reference/roche_derive_rave_row.htm

Headers also provide some examples about --SPID