Update refreshmod docs.

This also affects pathmod here.

Since it's updating module-info.json, we could say that as well (this
should affect any tools which parse this file), but I haven't seen any
indication it's necessary in this context.

Bug: N/A
Test: N/A
Change-Id: Iecb6f454112b5c0095ee7063bc5442fdb1e3bd09
diff --git a/envsetup.sh b/envsetup.sh
index 5e924ab..0ec7e6f 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -33,7 +33,7 @@
 - allmod:     List all modules.
 - gomod:      Go to the directory containing a module.
 - pathmod:    Get the directory containing a module.
-- refreshmod: Refresh list of modules for allmod/gomod.
+- refreshmod: Refresh list of modules for allmod/gomod/pathmod.
 
 Environment options:
 - SANITIZE_HOST: Set to 'address' to use ASAN for all host modules.