fixed PY-11595 Unable to move lines within Python doc strings

python/testData/mover/insideDocComment.py

@@ -0,0 +1,7 @@
+def fcn(self, foo, bar):
+    """
+    :type <caret>foo: int
+    :type bar: str
+    """
+    self.foo = foo
+    self.bar = bar 

python/testData/mover/insideDocComment_afterDown.py

@@ -0,0 +1,7 @@
+def fcn(self, foo, bar):
+    """
+    :type bar: str
+    :type foo: int
+    """
+    self.foo = foo
+    self.bar = bar 

python/testData/mover/insideDocComment_afterUp.py

@@ -0,0 +1,7 @@
+"""
+    :type foo: int
+    :type bar: str
+    """
+def fcn(self, foo, bar):
+    self.foo = foo
+    self.bar = bar