Closes #1716: Adds "Yield" alias for "Yields" section in napoleon extension

sphinx/ext/napoleon/docstring.py

@@ -148,6 +148,7 @@ class GoogleDocstring(UnicodeMixin):
                 'warning': self._parse_warning_section,
                 'warnings': self._parse_warning_section,
                 'warns': self._parse_warns_section,
+                'yield': self._parse_yields_section,
                 'yields': self._parse_yields_section,
             }
         self._parse()
@@ -590,7 +591,7 @@ class GoogleDocstring(UnicodeMixin):
         return self._format_fields('Warns', self._consume_fields())
 
     def _parse_yields_section(self, section):
-        fields = self._consume_fields(prefer_type=True)
+        fields = self._consume_returns_section()
         return self._format_fields('Yields', fields)
 
     def _strip_empty(self, lines):

tests/test_ext_napoleon_docstring.py

@@ -222,6 +222,33 @@ class GoogleDocstringTest(BaseDocstringTest):
                        Variable length argument list.
                      * **\\*\\*kwargs** --
                        Arbitrary keyword arguments."""
+    ), (
+        """
+        Single line summary
+
+        Yield:
+          str:Extended
+          description of yielded value
+        """,
+        """
+        Single line summary
+
+        :Yields: *str* --
+                 Extended
+                 description of yielded value"""
+    ), (
+        """
+        Single line summary
+
+        Yields:
+          Extended
+          description of yielded value
+        """,
+        """
+        Single line summary
+
+        :Yields: Extended
+                 description of yielded value"""
     )]
 
     def test_docstrings(self):
@@ -424,7 +451,39 @@ class NumpyDocstringTest(BaseDocstringTest):
                        Variable length argument list.
                      * ****kwargs** --
                        Arbitrary keyword arguments."""
-    )]
+    ), (
+        """
+        Single line summary
+
+        Yield
+        -----
+        str
+            Extended
+            description of yielded value
+        """,
+        """
+        Single line summary
+
+        :Yields: *str* --
+                 Extended
+                 description of yielded value"""
+    ), (
+        """
+        Single line summary
+
+        Yields
+        ------
+        str
+            Extended
+            description of yielded value
+        """,
+        """
+        Single line summary
+
+        :Yields: *str* --
+                 Extended
+                 description of yielded value"""
+     )]
 
     def test_docstrings(self):
         config = Config(napoleon_use_param=False, napoleon_use_rtype=False)