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

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

Misc/NEWS.d/3.11.0b1.rst

@@ -570,7 +570,7 @@ planned). Patch by Alex Waygood.
 
 ..
 
-.. gh: 78157
+.. gh-issue: 78157
 .. date: 2022-05-05-20-40-45
 .. nonce: IA_9na
 .. section: Library
@@ -1289,7 +1289,7 @@ Deprecate the chunk module.
 
 ..
 
-.. gh: 91498
+.. gh-issue: 91498
 .. date: 2022-04-10-08-39-44
 .. nonce: 8oII92
 .. section: Library