The name of the Pipeline deprecated class

[Sank-WoT]

The examples below use outdated Pipe usage examples.

pipelines/examples/filters/conversation_turn_limit_filter.py

Line 8 in 039f9c5

class Pipeline:

Links to current class type checks

https://github.com/open-webui/open-webui/blob/1db8dec4f52fc0fa8f8f7bfbb8ea5bde41fee17d/src/lib/components/admin/Functions/FunctionEditor.svelte#L176

https://github.com/open-webui/open-webui/blob/1db8dec4f52fc0fa8f8f7bfbb8ea5bde41fee17d/backend/open_webui/utils/plugin.py#L150

Please fix the name in these examples.