[Cython] Fixed some problems building the Sphinx documentation

doc/sphinx/cython/importing.rst

@@ -15,4 +15,4 @@ thermodynamic, chemical kinetic, and (optionally) transport properties.
 Utility Functions
 -----------------
 
-.. autofunction:: addDirectory
+.. autofunction:: add_directory

doc/sphinx/cython/onedim.rst

@@ -11,10 +11,10 @@ Composite Domains
 
 Flow Domains
 ------------
-.. autoclass:: StagnationFlow
 .. autoclass:: FreeFlow
+    :inherited-members:
 .. autoclass:: AxisymmetricStagnationFlow
-
+    :inherited-members:
 
 Boundaries
 ----------

interfaces/cython/cantera/onedim.pyx

@@ -844,10 +844,9 @@ def _trim(docstring):
     if indent < 999:
         for line in lines[1:]:
             trimmed.append(line[indent:].rstrip())
-    # Strip off trailing and leading blank lines:
-    trimmed = [t for t in trimmed if t]
-    # Return a single string:
-    return '\n'.join(trimmed)
+
+    # Return a single string, with trailing and leading blank lines stripped
+    return '\n'.join(trimmed).strip('\n')
 
 def _array_property(attr, size=None):
     """