Merge pull request #7969 from github/doc-remove-filter-queries

Docs: remove mention of 'filter queries'

Author: aibaars

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

@@ -52,11 +52,6 @@ The following properties are supported by all query files:
 | ``@security-severity``| ``<score>``               | Defines the level of severity, between 0.0 and 10.0, for queries with ``@tags security``. For more information about calculating ``@security-severity``, see the `GitHub changelog <https://github.blog/changelog/2021-07-19-codeql-code-scanning-new-severity-levels-for-security-alerts/>`__.                                                                       |
 +-----------------------+---------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 
-Additional properties for filter queries
-----------------------------------------
-
-Filter queries are used to define additional constraints to limit the results that are returned by other queries. A filter query must have the same ``@kind`` property as the query whose results it is filtering. No additional metadata properties are required.
-
 Example
 -------