Fix docstring typo.
diff --git a/Lib/decimal.py b/Lib/decimal.py
index d8abf55..5d25012 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -3456,7 +3456,7 @@
# PEP 3101 support. See also _parse_format_specifier and _format_align
def __format__(self, specifier, context=None):
- """Format a Decimal class according to the given specifier.
+ """Format a Decimal instance according to the given specifier.
The specifier should be a standard format specifier, with the
form described in PEP 3101. Formatting types 'e', 'E', 'f',