Update instructions of doc updates when removing providers from release (#22199)
Update instructions of doc updates when removing providers from release (#22199)

When removing providers from release it might be that we remmove
just added provider due to bugs found, in which case more detailewd
instructions on what should be removed from prepared dodcumentation
is needed.

Related to #22197
danielvdende/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,lyft/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow