Merge branch 'bc/sha-256-part-1-of-4'

Docfix.

* bc/sha-256-part-1-of-4:
  Documentation: correct hash environment variable

Author: gitster

Documentation/git.txt

@@ -493,7 +493,7 @@ double-quotes and respecting backslash escapes. E.g., the value
 	details. This variable has lower precedence than other path
 	variables such as GIT_INDEX_FILE, GIT_OBJECT_DIRECTORY...
 
-`GIT_DEFAULT_HASH_ALGORITHM`::
+`GIT_DEFAULT_HASH`::
 	If this variable is set, the default hash algorithm for new
 	repositories will be set to this value. This value is currently
 	ignored when cloning; the setting of the remote repository