[3.15] Add versionadded tag to wave module getformat functions (GH-153897) (#153898)

Add versionadded tag to wave module getformat functions (GH-153897)
(cherry picked from commit 7ce9eb1)

Co-authored-by: Elias Dorneles <eliasdorneles@gmail.com>

Author: miss-islington

Doc/library/wave.rst

@@ -125,6 +125,8 @@ Wave_read Objects
       This is one of :data:`WAVE_FORMAT_PCM`,
       :data:`WAVE_FORMAT_IEEE_FLOAT`, or :data:`WAVE_FORMAT_EXTENSIBLE`.
 
+      .. versionadded:: 3.15
+
 
    .. method:: getcomptype()
 
@@ -284,6 +286,8 @@ Wave_write Objects
 
       Return the current frame format code.
 
+      .. versionadded:: 3.15
+
 
    .. method:: setparams(tuple)