Add note about documentation being incomplete.

Author: PurelyApplied

contributors/devel/sig-testing/verify-tests.md

@@ -4,6 +4,7 @@
 
 - [Verification Tests](#verification-tests)
   - [Overview](#overview)
+  - [Note](#note)
   - [`verify-govet-levee`](#verify-govet-leve)
 
 ## Overview
@@ -19,6 +20,10 @@ Most verification tests are self-explanatory.
 The verification tests fails when `go vet` produces any findings.
 More complex verification tests are described below.
 
+### Note
+
+This documentation is a work in progress.  This listing is incomplete.
+
 ### `verify-govet-levee`
 
 Verification in `verify-govet-levee.sh` uses taint propagation analysis