doc: correct and amend NEWS entries for 2.6.1

* NEWS (Bug fixes): Correct character ranges bug description.
Add an example from Dmitry V. Levin.
Add that the word-with-backref bug was introduced in 2.5.1.
* cfg.mk (old_NEWS_hash): Update to match.

2 files changed, 6 insertions, 3 deletions

diff --git a/NEWS b/NEWS
index 32ea885b..2e0414e8 100644
--- a/NEWS
+++ b/NEWS
@@ -11,10 +11,13 @@ GNU grep NEWS                                    -*- outline -*-
   multibyte character.  [bug introduced in 2.6]
 
   Character ranges would not work in single-byte character sets other
-  than C (for example, ISO-8859-1 or KOI8-R).  [bug introduced in 2.6]
+  than C (for example, ISO-8859-1 or KOI8-R) and some multi-byte locales.
+  For example, this should print "1", but would find no match:
+    $ echo 1 | env -i LC_COLLATE=en_US.UTF-8 grep '[0-9]'
+  [bug introduced in 2.6]
 
   The output of grep was incorrect for whole-word (-w) matches if the
-  patterns included a backreference.
+  patterns included a back-reference. [bug introduced in grep-2.5.2]
 
 ** Portability
 
diff --git a/cfg.mk b/cfg.mk
index 7dca4f94..7f0aebea 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -31,7 +31,7 @@ bootstrap-tools = autoconf,automake,gnulib
 # Now that we have better tests, make this the default.
 export VERBOSE = yes
 
-old_NEWS_hash = 72edfd3113c3b264a77f6f9efab18e38
+old_NEWS_hash = fbb9531f83022157e85039a8ed8f6dad
 
 # Many m4 macros names once began with `jm_'.
 # Make sure that none are inadvertently reintroduced.