docs: Added documentation for Django/Flask integrations and dictConfig (#848)

* docs: Added documentation for Django/Flask integrations and dictConfig

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Added product prefix to new snippet

* Added client setup in sample + link to settings in documentation

* Changed django links to point to `/stable/` links

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gkevinzheng

logging/samples/snippets/usage_guide.py

@@ -484,6 +484,37 @@ def setup_logging(client):
     # [END setup_logging_excludes]
 
 
+@snippet
+def logging_dict_config(client):
+    import logging.config
+
+    # [START logging_dict_config]
+    import google.cloud.logging
+
+    client = google.cloud.logging.Client()
+
+    LOGGING = {
+        "version": 1,
+        "handlers": {
+            "cloud_logging": {
+                "class": "google.cloud.logging.handlers.CloudLoggingHandler",
+                "client": client,
+            },
+            "structured_log": {
+                "class": "google.cloud.logging.handlers.StructuredLogHandler"
+            },
+        },
+        "root": {"handlers": ["console"], "level": "WARNING"},
+        "loggers": {
+            "my_logger": {"handlers": ["cloud_logging"], "level": "INFO"},
+            "my_other_logger": {"handlers": ["structured_log"], "level": "INFO"},
+        },
+    }
+    # [END logging_dict_config]
+
+    logging.config.dictConfig(LOGGING)
+
+
 def _line_no(func):
     return func.__code__.co_firstlineno