Add more missing Raises sections.

Author: Julian

referencing/_core.py

@@ -60,6 +60,14 @@ def from_contents(
     ) -> Resource[D]:
         """
         Attempt to discern which specification applies to the given contents.
+
+        Raises:
+
+            `CannotDetermineSpecification`
+
+                if the given contents don't have any discernible
+                information which could be used to guess which
+                specification they identify as
         """
         specification = default_specification
         if isinstance(contents, Mapping):

referencing/jsonschema.py

@@ -65,6 +65,12 @@ def specification_with(
 ) -> Specification[Any]:
     """
     Retrieve the `Specification` with the given dialect identifier.
+
+    Raises:
+
+        `UnknownDialect`
+
+            if the given ``dialect_id`` isn't known
     """
     resource = _SPECIFICATIONS.get(dialect_id)
     if resource is not None: