Merge branch 'jb/doc-multi-pack-idx-fix'

Typofix.

* jb/doc-multi-pack-idx-fix:
  multi-pack-index: correct configuration in documentation

Documentation/technical/multi-pack-index.txt

@@ -36,7 +36,7 @@ Design Details
   directory of an alternate. It refers only to packfiles in that
   same directory.
 
-- The pack.multiIndex config setting must be on to consume MIDX files.
+- The core.multiPackIndex config setting must be on to consume MIDX files.
 
 - The file format includes parameters for the object ID hash
   function, so a future change of hash algorithm does not require