pyc{ompile,lean}.rst: add a note about combining with DIR_OF_FILE

pyclean.rst

@@ -24,3 +24,4 @@ OPTIONS
 -q, --quiet	be quiet
 
 -p PACKAGE, --package=PACKAGE	specify Debian package name to clean
+  (combining with DIR_OR_FILE will additionally limit list of files)

pycompile.rst

@@ -35,7 +35,8 @@ OPTIONS
 -v, --verbose	turn verbose mode on
 
 -p PACKAGE, --package=PACKAGE	specify Debian package name whose files should
-  be bytecompiled
+  be bytecompiled (combining with DIR_OR_FILE will additionally limit list of
+  files)
 
 -V VRANGE	force private modules to be bytecompiled with Python
   version from given range, regardless of the default Python version in the