Added missing-yield-type-doc message example (#6345)

Author: matusvalo

doc/data/messages/m/missing-yield-type-doc/bad.py

@@ -0,0 +1,12 @@
+def even_number_under(n: int):  # [missing-yield-type-doc]
+    """Prints even numbers smaller than n.
+    Args:
+        n: Upper limit of even numbers.
+
+    Yields:
+        even numbers
+    """
+    for i in range(n):
+        if i % 2 == 1:
+            continue
+        yield i

doc/data/messages/m/missing-yield-type-doc/details.rst

@@ -0,0 +1 @@
+This message is raised only when parameter ``accept-no-yields-doc`` is set to ``no``.

doc/data/messages/m/missing-yield-type-doc/good.py

@@ -0,0 +1,15 @@
+from typing import Iterator
+
+
+def even_number_under(n: int) -> Iterator[int]:
+    """Prints even numbers smaller than n.
+    Args:
+        n: Upper limit of even numbers.
+
+    Yields:
+        even numbers
+    """
+    for i in range(n):
+        if i % 2 == 1:
+            continue
+        yield i

doc/data/messages/m/missing-yield-type-doc/pylintrc

@@ -0,0 +1,5 @@
+[master]
+load-plugins=pylint.extensions.docparams
+
+[Parameter_documentation]
+accept-no-yields-doc=no