python: Convert type checks to isinstance checks.

Generated by autopep8 --aggressive, with the setup.cfg configuration
from #14532.  In general, an isinstance check may not be equivalent to
a type check because it includes subtypes; however, that’s usually
what you want.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

zerver/lib/bugdown/api_code_examples.py

@@ -148,7 +148,7 @@ cURL example.""".format(endpoint, method, param_name)
         return ordered_ex_val_str  # nocoverage
     else:
         example_value = param.get("example", DEFAULT_EXAMPLE[param_type])
-        if type(example_value) == bool:
+        if isinstance(example_value, bool):
             example_value = str(example_value).lower()
         if param["schema"].get("format", "") == "json":
             example_value = json.dumps(example_value)