Python: Mention modeling of mysqlclient PyPI package

Just for completeness in terms of what we claim support for.

Author: RasmusWL

docs/codeql/support/reusables/frameworks.rst

@@ -171,6 +171,7 @@ Python built-in support
    mysql-connector-python, Database
    mysql-connector, Database
    MySQL-python, Database
+   mysqlclient, Database
    psycopg2, Database
    sqlite3, Database
    cryptography, Cryptography library

python/ql/src/semmle/python/frameworks/MySQLdb.qll

@@ -1,6 +1,6 @@
 /**
- * Provides classes modeling security-relevant aspects of the `MySQL-python` PyPI package
- * (imported as `MySQLdb`).
+ * Provides classes modeling security-relevant aspects of the `MySQL-python` and `mysqlclient` PyPI packages
+ * (both imported as `MySQLdb`) -- the `mysqlclient` package is a fork of `MySQL-python`.
  *
  * See
  * - https://mysqlclient.readthedocs.io/index.html
@@ -15,10 +15,13 @@ private import semmle.python.ApiGraphs
 private import semmle.python.frameworks.PEP249
 
 /**
- * Provides models for the `MySQL-python` PyPI package (imported as `MySQLdb`).
+ * Provides models for the `MySQL-python` and `mysqlclient` PyPI packages
+ * (both imported as `MySQLdb`) -- the `mysqlclient` package is a fork of `MySQL-python`.
+ *
  * See
  * - https://mysqlclient.readthedocs.io/index.html
  * - https://pypi.org/project/MySQL-python/
+ * - https://pypi.org/project/mysqlclient/
  */
 private module MySQLdb {
   // ---------------------------------------------------------------------------