DOC: Explain that local sss dir is not needed

pylinkahead.ini.template

@@ -8,8 +8,9 @@
 ## permissions to create and execute scripts.
 
 # Location of a temp dir into which the server-side scripts can be
-# copied during the SSS tests.
-test_server_side_scripting.bin_dir.local=/path/to/linkahead-pyinttest/sss-temp/
+# copied during the SSS tests. This is not needed; the tests will use
+# /tmp/... if none is given.
+# test_server_side_scripting.bin_dir.local=/path/to/linkahead-pyinttest/sss-temp/
 
 # Location of the scripting bin debug dir which is used for the test
 # scripts from the server's perspective.