Merge branch 'jh/clean-smudge-f-doc'

A minor documentation update.

* jh/clean-smudge-f-doc:
  clarify %f documentation

Documentation/gitattributes.txt

@@ -377,6 +377,11 @@ substitution.  For example:
 	smudge = git-p4-filter --smudge %f
 ------------------------
 
+Note that "%f" is the name of the path that is being worked on. Depending
+on the version that is being filtered, the corresponding file on disk may
+not exist, or may have different contents. So, smudge and clean commands
+should not try to access the file on disk, but only act as filters on the
+content provided to them on standard input.
 
 Interaction between checkin/checkout attributes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^