update docs

Author: soapun

docs/generators/python.md

@@ -25,7 +25,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |generateSourceCodeOnly|Specifies that only a library source code is to be generated.| |false|
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |true|
 |lazyImports|Enable lazy imports.| |false|
-|library|library template (sub-template) to use: asyncio, tornado (deprecated), urllib3| |urllib3|
+|library|library template (sub-template) to use: asyncio, tornado (deprecated), urllib3, httpx| |urllib3|
 |mapNumberTo|Map number to Union[StrictFloat, StrictInt], StrictStr or float.| |Union[StrictFloat, StrictInt]|
 |packageName|python package name (convention: snake_case).| |openapi_client|
 |packageUrl|python package URL.| |null|