Fix uses of the default role.
diff --git a/Doc/library/fractions.rst b/Doc/library/fractions.rst
index aad62dd..36df11c 100644
--- a/Doc/library/fractions.rst
+++ b/Doc/library/fractions.rst
@@ -101,11 +101,11 @@
.. function:: gcd(a, b)
- Return the greatest common divisor of the integers `a` and `b`. If
- either `a` or `b` is nonzero, then the absolute value of `gcd(a,
- b)` is the largest integer that divides both `a` and `b`. `gcd(a,b)`
- has the same sign as `b` if `b` is nonzero; otherwise it takes the sign
- of `a`. `gcd(0, 0)` returns `0`.
+ Return the greatest common divisor of the integers *a* and *b*. If either
+ *a* or *b* is nonzero, then the absolute value of ``gcd(a, b)`` is the
+ largest integer that divides both *a* and *b*. ``gcd(a,b)`` has the same
+ sign as *b* if *b* is nonzero; otherwise it takes the sign of *a*. ``gcd(0,
+ 0)`` returns ``0``.
.. seealso::