saw-remote-api: Out-of-date documentation in "Crucible setup values" section

[RyanGlScott]

Currently, the Crucible setup values section of the SAW remote API documentation lists the following values that the setup value tag can be:

• saved
• null value
• Cryptol
• array value
• field lvalue
• element lvalue
• global initializer
• global lvalue

This doesn't quite agree with what's in the current implementation of saw-remote-api, however:

saw-script/saw-remote-api/src/SAWServer/Data/SetupValue.hs

Lines 22 to 51 in e3a317a

	instance FromJSON SetupValTag where
	parseJSON =
	withText "tag for setup value" $
	\case
	"named" -> pure TagNamedValue
	"null" -> pure TagNullValue
	"Cryptol" -> pure TagCryptol
	"array" -> pure TagArrayValue
	"struct" -> pure TagStructValue
	"field" -> pure TagFieldLValue
	"element lvalue" -> pure TagElemLValue
	"global initializer" -> pure TagGlobalInit
	"global lvalue" -> pure TagGlobalLValue
	_ -> empty
	instance FromJSON cryptolExpr => FromJSON (CrucibleSetupVal cryptolExpr) where
	parseJSON v = fromObject v
	where
	fromObject = withObject "saved value or Cryptol expression" $ \o ->
	o .: "setup value" >>=
	\case
	TagNamedValue -> NamedValue <$> o .: "name"
	TagNullValue -> pure NullValue
	TagCryptol -> CryptolExpr <$> o .: "expression"
	TagArrayValue -> ArrayValue <$> o .: "elements"
	TagStructValue -> StructValue <$> o .: "fields"
	TagFieldLValue -> FieldLValue <$> o .: "base" <*> o .: "field"
	TagElemLValue -> ElementLValue <$> o .: "base" <*> o .: "index"
	TagGlobalInit -> GlobalInitializer <$> o .: "name"
	TagGlobalLValue -> GlobalLValue <$> o .: "name"

In particular:

• The implementation uses named, instead of saved as in the documentation.
• The implementation uses null and array, instead of null value and array value as in the documentation.
• The implementation uses field, instead of field lvalue as in the documentation.
• The implementation has a struct tag that isn't mentioned in the documentation at all.

We should sync the documentation with respect to the current state of the implementation.