gh-130662: Remove unnecessary plus sign from a news entry (#160723)

Author: rffontenelle

Misc/NEWS.d/3.15.0a1.rst

@@ -2768,8 +2768,8 @@ Fix the "Invalid error handling" exception in
 .. nonce: Gpr2GB
 .. section: Library
 
-+Accept leading zeros in precision and width fields for
-+:class:`~decimal.Decimal` formatting, for example ``format(Decimal(1.25),
+Accept leading zeros in precision and width fields for
+:class:`~decimal.Decimal` formatting, for example ``format(Decimal(1.25),
 '.016f')``.
 
 ..