borg diff help: clarify: for new archives different chunker params still require content compare

borg/archiver.py

@@ -1212,7 +1212,8 @@ class Archiver:
             Both archives need to be in the same repository, and a repository location may only
             be specified for ARCHIVE1.
 
-            For archives created with Borg 1.1 or newer only chunks IDs
+            For archives created with Borg 1.1 or newer diff automatically detects whether
+            the archives are created with the same chunker params. If so, only chunk IDs
             are compared, which is very fast.
 
             For archives prior to Borg 1.1 chunk contents are compared by default.

docs/usage/diff.rst.inc

@@ -48,7 +48,8 @@ This command finds differences in files (contents, user, group, mode) between ar
 Both archives need to be in the same repository, and a repository location may only
 be specified for ARCHIVE1.
 
-For archives created with Borg 1.1 or newer only chunks IDs
+For archives created with Borg 1.1 or newer diff automatically detects whether
+the archives are created with the same chunker params. If so, only chunk IDs
 are compared, which is very fast.
 
 For archives prior to Borg 1.1 chunk contents are compared by default.