Docs: add previous-id property to metadata-for-codeql-queries.rst

Author: Jami Cogswell

docs/codeql/writing-codeql-queries/metadata-for-codeql-queries.rst

@@ -30,6 +30,8 @@ The following properties are supported by all query files:
 +-----------------------+---------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``@id``               | ``<text>``                | A sequence of words composed of lowercase letters or digits, delimited by ``/`` or ``-``, identifying and classifying the query. Each query must have a **unique** ID. To ensure this, it may be helpful to use a fixed structure for each ID. For example, the standard CodeQL queries have the following format: ``<language>/<brief-description>``.                |
 +-----------------------+---------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ``@previous-id``      | ``<text>``                | Indicates that query results were previously reported on a different query. The previous id should be a sequence of words composed of lowercase letters or digits, delimited by ``/`` or ``-``, identifying and classifying the previous query.                                                                                                                       |
++-----------------------+---------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``@kind``             | | ``problem``             | Identifies the query is an alert (``@kind problem``) or a path (``@kind path-problem``). For more information on these query types, see ":doc:`About CodeQL queries <about-codeql-queries>`."                                                                                                                                                                         |
 |                       | | ``path-problem``        |                                                                                                                                                                                                                                                                                                                                                                       |
 +-----------------------+---------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+