Use sentence case in section titles consistently

diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 6ef4443151a781f6277ac4c410853a35a7f8d5dd..2396622722949c63f14f7a1c499dc63b60b730eb 100644 (file)
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1161,7 +1161,7 @@ not bother to return a value of the same type as its argument, so e.g., ``not
 'foo'`` yields ``False``, not ``''``.)
 
 
-Conditional Expressions
+Conditional expressions
 =======================
 
 .. index::