update documentation to include math.exp2

Author: Turreted

Doc/library/math.rst

@@ -355,6 +355,11 @@ Power and logarithmic functions
    of natural logarithms.  This is usually more accurate than ``math.e ** x``
    or ``pow(math.e, x)``.
 
+.. function:: exp2(x)
+
+   Return *2* raised to the power *x*.
+
+   .. versionadded:: 3.11
 
 .. function:: expm1(x)
 

Doc/whatsnew/3.11.rst

@@ -203,6 +203,8 @@ fractions
 
 math
 ----
+* Add :func:`math.exp2`: return 2 raised to the power of x.
+  (Contributed by Gideon Mitchell in :issue:`45917`.)
 
 * Add :func:`math.cbrt`: return the cube root of x.
   (Contributed by Ajith Ramachandran in :issue:`44357`.)

Misc/ACKS

@@ -1191,6 +1191,7 @@ Julien Miotte
 Andrii V. Mishkovskyi
 Dom Mitchell
 Dustin J. Mitchell
+Gideon Mitchell
 Tim Mitchell
 Zubin Mithra
 Florian Mladitsch