gh-128874: Fix the documentation for blurb 2.0 (#128875)

(cherry picked from commit 40a4d88)

Author: vstinner

Misc/NEWS.d/3.10.0b1.rst

@@ -941,7 +941,7 @@ result from ``entry_points()`` as deprecated.
 
 ..
 
-.. gh: 47383
+.. gh-issue: 47383
 .. date: 2021-04-08-19-32-26
 .. nonce: YI1hdL
 .. section: Library