[AIRFLOW-XXX] Fix typo in http_operator.py
[AIRFLOW-XXX] Fix typo in http_operator.py

Replace sensor by operator in the comment:
`:param http_conn_id: The connection to run the
sensor against` by `:param http_conn_id: The
connection to run the operator against`

Closes #3544 from thibaultclem/patch-1

apache/airflow,mistercrunch/airflow,lxneng/incubator-airflow,nathanielvarona/airflow,wooga/airflow,adamhaney/airflow,mrkm4ntr/incubator-airflow,sekikn/incubator-airflow,cfei18/incubator-airflow,sergiohgz/incubator-airflow,Fokko/incubator-airflow,spektom/incubator-airflow,cfei18/incubator-airflow,r39132/airflow,lyft/incubator-airflow,edgarRd/incubator-airflow,malmiron/incubator-airflow,apache/airflow,andyxhadji/incubator-airflow,lxneng/incubator-airflow,r39132/airflow,apache/airflow,artwr/airflow,sid88in/incubator-airflow,mrkm4ntr/incubator-airflow,Acehaidrey/incubator-airflow,DinoCow/airflow,airbnb/airflow,nathanielvarona/airflow,mtagle/airflow,subodhchhabra/airflow,lyft/incubator-airflow,adamhaney/airflow,dhuang/incubator-airflow,apache/incubator-airflow,jgao54/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,artwr/airflow,DinoCow/airflow,gtoonstra/airflow,Fokko/incubator-airflow,mtagle/airflow,malmiron/incubator-airflow,sekikn/incubator-airflow,mtagle/airflow,wileeam/airflow,andyxhadji/incubator-airflow,adamhaney/airflow,malmiron/incubator-airflow,jgao54/airflow,fenglu-g/incubator-airflow,jgao54/airflow,mistercrunch/airflow,sergiohgz/incubator-airflow,wooga/airflow,bolkedebruin/airflow,Fokko/incubator-airflow,subodhchhabra/airflow,nathanielvarona/airflow,criccomini/airflow,edgarRd/incubator-airflow,Acehaidrey/incubator-airflow,malmiron/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,lxneng/incubator-airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,DinoCow/airflow,sid88in/incubator-airflow,adamhaney/airflow,sid88in/incubator-airflow,criccomini/airflow,sergiohgz/incubator-airflow,bolkedebruin/airflow,mrkm4ntr/incubator-airflow,akosel/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,dhuang/incubator-airflow,criccomini/airflow,airbnb/airflow,edgarRd/incubator-airflow,gtoonstra/airflow,andyxhadji/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,subodhchhabra/airflow,danielvdende/incubator-airflow,r39132/airflow,apache/incubator-airflow,apache/incubator-airflow,wileeam/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,gtoonstra/airflow,danielvdende/incubator-airflow,wileeam/airflow,lyft/incubator-airflow,spektom/incubator-airflow,cfei18/incubator-airflow,DinoCow/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,dhuang/incubator-airflow,gtoonstra/airflow,wileeam/airflow,akosel/incubator-airflow,mrkm4ntr/incubator-airflow,sergiohgz/incubator-airflow,jgao54/airflow,artwr/airflow,apache/airflow,fenglu-g/incubator-airflow,airbnb/airflow,fenglu-g/incubator-airflow,wooga/airflow,Fokko/incubator-airflow,danielvdende/incubator-airflow,artwr/airflow,edgarRd/incubator-airflow,sekikn/incubator-airflow,airbnb/airflow,akosel/incubator-airflow,fenglu-g/incubator-airflow,wooga/airflow,subodhchhabra/airflow,spektom/incubator-airflow,apache/airflow,mtagle/airflow,danielvdende/incubator-airflow,sekikn/incubator-airflow,r39132/airflow,apache/incubator-airflow,bolkedebruin/airflow,andyxhadji/incubator-airflow,lxneng/incubator-airflow,mistercrunch/airflow,criccomini/airflow,sid88in/incubator-airflow,spektom/incubator-airflow,akosel/incubator-airflow