Add more cases to pattern matching about documentation HOT 2 OPEN

There's some good feedback here; thanks!

As you've noted, the division of the language guide into multiple files is a little ad-hoc, and some things are difficult to discover if you aren't reading the entire thing. Several of the syntaxes you're asking about are in the Case expressions section of Syntax.md, instead of in Pattern-Matching.md.

PureScript doesn't have an equivalent to F#'s OR patterns; it was discussed in purescript/purescript#542 back in PureScript's infancy, but nothing came of it. Multiple pattern guards separated by commas all must match for that branch to be selected, so the example you gave in PureScript is actually analogous to an F# AND pattern.

from documentation.

@rhendric Thanks a lot for replying!

Thank you for pointing out the syntax section, I guess it could be ok to duplicate that in the pattern matching section.

so the example you gave in PureScript is actually analogous to an F# AND pattern.
Thanks! Good to know that's an AND Pattern and OR is not expressable rn 👍

from documentation.