Update formatting and docstrings [ci skip]

spacy/errors.py

@@ -496,7 +496,8 @@ class Errors(object):
     E173 = ("As of v2.2, the Lemmatizer is initialized with an instance of "
             "Lookups containing the lemmatization tables. See the docs for "
             "details: https://spacy.io/api/lemmatizer#init")
-    E174 = ("Architecture {name} not found in registry. Available names: {names}")
+    E174 = ("Architecture '{name}' not found in registry. Available "
+            "names: {names}")
 
 
 @add_codes

spacy/util.py

@@ -124,6 +124,11 @@ def set_data_path(path):
 def register_architecture(name, arch=None):
     """Decorator to register an architecture. An architecture is a function
     that returns a Thinc Model object.
+
+    name (unicode): The name of the architecture to register.
+    arch (Model): Optional architecture if function is called directly and
+        not used as a decorator.
+    RETURNS (callable): Function to register architecture.
     """
     global ARCHITECTURES
     if arch is not None:
@@ -138,7 +143,12 @@ def register_architecture(name, arch=None):
 
 
 def get_architecture(name):
-    """Get a model architecture function by name."""
+    """Get a model architecture function by name. Raises a KeyError if the
+    architecture is not found.
+
+    name (unicode): The mame of the architecture.
+    RETURNS (Model): The architecture.
+    """
     # Check if an entry point is exposed for the architecture code
     entry_point = get_entry_point(ENTRY_POINTS.architectures, name)
     if entry_point is not None: