[Issue template] need to update/extend who to tag (#10728)

* [Issue template] need to update/extend who to tag

1. need to update who to tag for `tensorflow`
2. also requesting to add someone to tag for models hub issues - perhaps separate sub-entries for UI and code - e.g. I don't know who to tag for broken models: https://github.com/huggingface/transformers/issues/10726

Thanks.

* model hub instructions

* s/jplu/LysandreJik/

.github/ISSUE_TEMPLATE/bug-report.md

@@ -34,7 +34,7 @@ Models:
 - funnel: @sgugger
 - gpt2: @patrickvonplaten, @LysandreJik
 - rag: @patrickvonplaten, @lhoestq
-- tensorflow: @jplu
+- tensorflow: @LysandreJik
 
 Library:
 
@@ -48,6 +48,10 @@ Library:
 
 Documentation: @sgugger
 
+Model hub:
+
+- for issues with a model report at https://discuss.huggingface.co/ and tag the model's creator.
+
 HF projects:
 
 - nlp datasets: [different repo](https://github.com/huggingface/nlp)

.github/PULL_REQUEST_TEMPLATE.md

@@ -46,7 +46,7 @@ Models:
 - funnel: @sgugger
 - gpt2: @patrickvonplaten, @LysandreJik
 - rag: @patrickvonplaten, @lhoestq
-- tensorflow: @jplu
+- tensorflow: @LysandreJik
 
 Library: