Update query description to better describe issue

Author: egregius313

java/ql/src/Security/CWE/CWE-276/ContentProviderIncompletePermissions.ql

@@ -1,6 +1,6 @@
 /**
  * @name Missing read or write permission in a content provider
- * @description Defining an incomplete set of permissions
+ * @description Android content providers which do not configure both read and write permissions can allow permission bypass
  * @kind problem
  * @problem.severity warning
  * @security-severity 7.8