Remove unused files and update qldoc

Author: luchua-bc

java/ql/test/experimental/query-tests/security/CWE-555/CredentialsInPropertiesFile.ql

@@ -1,20 +1,6 @@
-/**
- * @name Cleartext Credentials in Properties File
- * @description Finds cleartext credentials in Java properties files.
- * @kind problem
- * @id java/credentials-in-properties
- * @tags security
- *       external/cwe/cwe-555
- *       external/cwe/cwe-256
- *       external/cwe/cwe-260
- */
-
 /*
- * Note this query requires properties files to be indexed before it can produce results.
- * If creating your own database with the CodeQL CLI, you should run
- * `codeql database index-files --language=properties ...`
- * If using lgtm.com, you should add `properties_files: true` to the index block of your
- * lgtm.yml file (see https://lgtm.com/help/lgtm/java-extraction#customizing-index)
+ * Note this is similar to src/experimental/Security/CWE/CWE-555/CredentialsInPropertiesFile.ql
+ * except we do not filter out test files.
  */
 
 import java